diff --git a/apps/dav/appinfo/info.xml b/apps/dav/appinfo/info.xml
index b0bcc782d9..150835adde 100644
--- a/apps/dav/appinfo/info.xml
+++ b/apps/dav/appinfo/info.xml
@@ -5,7 +5,7 @@
 	<name>WebDAV</name>
 	<summary>WebDAV endpoint</summary>
 	<description>WebDAV endpoint</description>
-	<version>1.16.1</version>
+	<version>1.16.2</version>
 	<licence>agpl</licence>
 	<author>owncloud.org</author>
 	<namespace>DAV</namespace>
diff --git a/apps/dav/lib/Migration/Version1004Date20170825134824.php b/apps/dav/lib/Migration/Version1004Date20170825134824.php
index a6a9703dc4..9ba3b18d1d 100644
--- a/apps/dav/lib/Migration/Version1004Date20170825134824.php
+++ b/apps/dav/lib/Migration/Version1004Date20170825134824.php
@@ -251,6 +251,12 @@ class Version1004Date20170825134824 extends SimpleMigrationStep {
 			]);
 			$table->setPrimaryKey(['id']);
 			$table->addUniqueIndex(['principaluri', 'uri'], 'calendars_index');
+		} else {
+			$table = $schema->getTable('calendars');
+			$table->changeColumn('components', [
+				'notnull' => false,
+				'length' => 64,
+			]);
 		}
 
 		if (!$schema->hasTable('calendarchanges')) {
@@ -335,6 +341,12 @@ class Version1004Date20170825134824 extends SimpleMigrationStep {
 			]);
 			$table->setPrimaryKey(['id']);
 			$table->addUniqueIndex(['principaluri', 'uri'], 'calsub_index');
+		} else {
+			$table = $schema->getTable('calendarsubscriptions');
+			$table->changeColumn('lastmodified', [
+				'notnull' => false,
+				'unsigned' => true,
+			]);
 		}
 
 		if (!$schema->hasTable('schedulingobjects')) {
diff --git a/apps/files_external/lib/Migration/Version1011Date20200630192246.php b/apps/files_external/lib/Migration/Version1011Date20200630192246.php
index d3aa630d53..934a9e3478 100644
--- a/apps/files_external/lib/Migration/Version1011Date20200630192246.php
+++ b/apps/files_external/lib/Migration/Version1011Date20200630192246.php
@@ -121,6 +121,12 @@ class Version1011Date20200630192246 extends SimpleMigrationStep {
 			$table->setPrimaryKey(['config_id']);
 			$table->addIndex(['mount_id'], 'config_mount');
 			$table->addUniqueIndex(['mount_id', 'key'], 'config_mount_key');
+		} else {
+			$table = $schema->getTable('external_config');
+			$table->changeColumn('value', [
+				'notnull' => false,
+				'length' => 4096,
+			]);
 		}
 
 		if (!$schema->hasTable('external_options')) {
diff --git a/core/Application.php b/core/Application.php
index 4a4d2c6ef3..6aec7fd230 100644
--- a/core/Application.php
+++ b/core/Application.php
@@ -144,6 +144,10 @@ class Application extends App {
 					if (!$table->hasIndex('cards_abid')) {
 						$subject->addHintForMissingSubject($table->getName(), 'cards_abid');
 					}
+
+					if (!$table->hasIndex('cards_abiduri')) {
+						$subject->addHintForMissingSubject($table->getName(), 'cards_abiduri');
+					}
 				}
 
 				if ($schema->hasTable('cards_properties')) {
diff --git a/core/Command/Db/AddMissingIndices.php b/core/Command/Db/AddMissingIndices.php
index c4d8f6d7e3..41ce626405 100644
--- a/core/Command/Db/AddMissingIndices.php
+++ b/core/Command/Db/AddMissingIndices.php
@@ -193,8 +193,23 @@ class AddMissingIndices extends Command {
 		}
 
 		$output->writeln('<info>Check indices of the cards table.</info>');
+		$cardsUpdated = false;
 		if ($schema->hasTable('cards')) {
 			$table = $schema->getTable('cards');
+
+			if ($table->hasIndex('addressbookid_uri_index')) {
+				$output->writeln('<info>Renaming addressbookid_uri_index index to  to the cards table, this can take some time...</info>');
+
+				foreach ($table->getIndexes() as $index) {
+					if ($index->getColumns() === ['addressbookid', 'uri']) {
+						$table->renameIndex('addressbookid_uri_index', 'cards_abiduri');
+					}
+				}
+
+				$this->connection->migrateToSchema($schema->getWrappedSchema());
+				$cardsUpdated = true;
+			}
+
 			if (!$table->hasIndex('cards_abid')) {
 				$output->writeln('<info>Adding cards_abid index to the cards table, this can take some time...</info>');
 
@@ -206,6 +221,24 @@ class AddMissingIndices extends Command {
 
 				$table->addIndex(['addressbookid'], 'cards_abid');
 				$this->connection->migrateToSchema($schema->getWrappedSchema());
+				$cardsUpdated = true;
+			}
+
+			if (!$table->hasIndex('cards_abiduri')) {
+				$output->writeln('<info>Adding cards_abiduri index to the cards table, this can take some time...</info>');
+
+				foreach ($table->getIndexes() as $index) {
+					if ($index->getColumns() === ['addressbookid', 'uri']) {
+						$table->dropIndex($index->getName());
+					}
+				}
+
+				$table->addIndex(['addressbookid', 'uri'], 'cards_abiduri');
+				$this->connection->migrateToSchema($schema->getWrappedSchema());
+				$cardsUpdated = true;
+			}
+
+			if ($cardsUpdated) {
 				$updated = true;
 				$output->writeln('<info>cards table updated successfully.</info>');
 			}
diff --git a/core/Migrations/Version13000Date20170718121200.php b/core/Migrations/Version13000Date20170718121200.php
index 6b252d8b83..a2616c9575 100644
--- a/core/Migrations/Version13000Date20170718121200.php
+++ b/core/Migrations/Version13000Date20170718121200.php
@@ -31,11 +31,37 @@ namespace OC\Core\Migrations;
 
 use Doctrine\DBAL\Types\Types;
 use OCP\DB\ISchemaWrapper;
+use OCP\IDBConnection;
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
 
 class Version13000Date20170718121200 extends SimpleMigrationStep {
 
+	/** @var IDBConnection */
+	private $connection;
+
+	public function __construct(IDBConnection $connection) {
+		$this->connection = $connection;
+	}
+
+	public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options) {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		if (!$schema->hasTable('properties')) {
+			return;
+		}
+		// in case we have a properties table from oc we drop it since we will only migrate
+		// the dav_properties values in the postSchemaChange step
+		$table = $schema->getTable('properties');
+		if ($table->hasColumn('fileid')) {
+			$qb = $this->connection->getQueryBuilder();
+			$qb->delete('properties');
+			$qb->execute();
+		}
+	}
+
+
 	/**
 	 * @param IOutput $output
 	 * @param \Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
@@ -122,6 +148,15 @@ class Version13000Date20170718121200 extends SimpleMigrationStep {
 			$table->addIndex(['root_id'], 'mounts_root_index');
 			$table->addIndex(['mount_id'], 'mounts_mount_id_index');
 			$table->addUniqueIndex(['user_id', 'root_id'], 'mounts_user_root_index');
+		} else {
+			$table = $schema->getTable('mounts');
+			$table->addColumn('mount_id', Types::BIGINT, [
+				'notnull' => false,
+				'length' => 20,
+			]);
+			if (!$table->hasIndex('mounts_mount_id_index')) {
+				$table->addIndex(['mount_id'], 'mounts_mount_id_index');
+			}
 		}
 
 		if (!$schema->hasTable('mimetypes')) {
@@ -320,6 +355,27 @@ class Version13000Date20170718121200 extends SimpleMigrationStep {
 			$table->setPrimaryKey(['id']);
 			$table->addIndex(['userid'], 'property_index');
 			$table->addIndex(['userid', 'propertypath'], 'properties_path_index');
+		} else {
+			$table = $schema->getTable('properties');
+			if ($table->hasColumn('propertytype')) {
+				$table->dropColumn('propertytype');
+			}
+			if ($table->hasColumn('fileid')) {
+				$table->dropColumn('fileid');
+			}
+			if (!$table->hasColumn('propertypath')) {
+				$table->addColumn('propertypath', 'string', [
+					'notnull' => true,
+					'length' => 255,
+				]);
+			}
+			if (!$table->hasColumn('userid')) {
+				$table->addColumn('userid', 'string', [
+					'notnull' => false,
+					'length' => 64,
+					'default' => '',
+				]);
+			}
 		}
 
 		if (!$schema->hasTable('share')) {
@@ -415,6 +471,14 @@ class Version13000Date20170718121200 extends SimpleMigrationStep {
 			$table->addIndex(['parent'], 'parent_index');
 			$table->addIndex(['uid_owner'], 'owner_index');
 			$table->addIndex(['uid_initiator'], 'initiator_index');
+		} else {
+			$table = $schema->getTable('share');
+			if (!$table->hasColumn('password')) {
+				$table->addColumn('password', 'string', [
+					'notnull' => false,
+					'length' => 255,
+				]);
+			}
 		}
 
 		if (!$schema->hasTable('jobs')) {
@@ -505,25 +569,25 @@ class Version13000Date20170718121200 extends SimpleMigrationStep {
 				'default' => '',
 			]);
 			$table->addColumn('type', 'smallint', [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 2,
 				'default' => 0,
 				'unsigned' => true,
 			]);
 			$table->addColumn('remember', 'smallint', [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 1,
 				'default' => 0,
 				'unsigned' => true,
 			]);
 			$table->addColumn('last_activity', 'integer', [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 4,
 				'default' => 0,
 				'unsigned' => true,
 			]);
 			$table->addColumn('last_check', 'integer', [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 4,
 				'default' => 0,
 				'unsigned' => true,
@@ -534,6 +598,11 @@ class Version13000Date20170718121200 extends SimpleMigrationStep {
 			$table->setPrimaryKey(['id']);
 			$table->addUniqueIndex(['token'], 'authtoken_token_index');
 			$table->addIndex(['last_activity'], 'authtoken_last_activity_idx');
+		} else {
+			$table = $schema->getTable('authtoken');
+			$table->addColumn('scope', 'text', [
+				'notnull' => false,
+			]);
 		}
 
 		if (!$schema->hasTable('bruteforce_attempts')) {
@@ -936,4 +1005,32 @@ class Version13000Date20170718121200 extends SimpleMigrationStep {
 		}
 		return $schema;
 	}
+
+	public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options) {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+		if (!$schema->hasTable('dav_properties')) {
+			return;
+		}
+		$query = $this->connection->getQueryBuilder();
+		$query->select('*')
+			->from('dav_properties');
+
+		$insert = $this->connection->getQueryBuilder();
+		$insert->insert('properties')
+			->setValue('propertypath', $insert->createParameter('propertypath'))
+			->setValue('propertyname', $insert->createParameter('propertyname'))
+			->setValue('propertyvalue', $insert->createParameter('propertyvalue'))
+			->setValue('userid', $insert->createParameter('userid'));
+
+		$result = $query->execute();
+		while ($row = $result->fetch()) {
+			preg_match('/(calendar)\/([A-z0-9-@_]+)\//', $row['propertypath'], $match);
+			$insert->setParameter('propertypath', (string) $row['propertypath'])
+				->setParameter('propertyname', (string) $row['propertyname'])
+				->setParameter('propertyvalue', (string) $row['propertyvalue'])
+				->setParameter('userid', (string) ($match[2] ?? ''));
+			$insert->execute();
+		}
+	}
 }
diff --git a/core/Migrations/Version13000Date20170919121250.php b/core/Migrations/Version13000Date20170919121250.php
index 330a0141eb..0667ea8733 100644
--- a/core/Migrations/Version13000Date20170919121250.php
+++ b/core/Migrations/Version13000Date20170919121250.php
@@ -63,8 +63,17 @@ class Version13000Date20170919121250 extends SimpleMigrationStep {
 		$column->setUnsigned(true);
 		$column = $table->getColumn('type');
 		$column->setUnsigned(true);
-		$column = $table->getColumn('remember');
-		$column->setUnsigned(true);
+		if ($table->hasColumn('remember')) {
+			$column = $table->getColumn('remember');
+			$column->setUnsigned(true);
+		} else {
+			$table->addColumn('remember', 'smallint', [
+				'notnull' => false,
+				'length' => 1,
+				'default' => 0,
+				'unsigned' => true,
+			]);
+		}
 		$column = $table->getColumn('last_activity');
 		$column->setUnsigned(true);
 		$column = $table->getColumn('last_check');
diff --git a/core/Migrations/Version21000Date20201120141228.php b/core/Migrations/Version21000Date20201120141228.php
new file mode 100644
index 0000000000..844679b8d9
--- /dev/null
+++ b/core/Migrations/Version21000Date20201120141228.php
@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OC\Core\Migrations;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version21000Date20201120141228 extends SimpleMigrationStep {
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		if ($schema->hasTable('authtoken')) {
+			$table = $schema->getTable('authtoken');
+			$loginNameColumn = $table->getColumn('login_name');
+			if ($loginNameColumn->getLength() !== 255) {
+				$loginNameColumn->setLength(255);
+			}
+			$table->changeColumn('type', [
+				'notnull' => false,
+			]);
+			$table->changeColumn('remember', [
+				'notnull' => false,
+			]);
+			$table->changeColumn('last_activity', [
+				'notnull' => false,
+			]);
+			$table->changeColumn('last_check', [
+				'notnull' => false,
+			]);
+		}
+
+		if ($schema->hasTable('dav_job_status')) {
+			$schema->dropTable('dav_job_status');
+		}
+
+		if ($schema->hasTable('systemtag')) {
+			$table = $schema->getTable('systemtag');
+			if ($table->hasColumn('systemtag')) {
+				$table->dropColumn('assignable');
+			}
+		}
+
+		if ($schema->hasTable('share')) {
+			$table = $schema->getTable('share');
+			if ($table->hasColumn('attributes')) {
+				$table->dropColumn('attributes');
+			}
+		}
+
+		if ($schema->hasTable('jobs')) {
+			$table = $schema->getTable('jobs');
+			$table->changeColumn('execution_duration', [
+				'notnull' => false,
+				'default' => 0,
+			]);
+		}
+
+		return $schema;
+	}
+}
diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 3db497983d..343f767528 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -924,6 +924,7 @@ return array(
     'OC\\Core\\Migrations\\Version20000Date20201109081918' => $baseDir . '/core/Migrations/Version20000Date20201109081918.php',
     'OC\\Core\\Migrations\\Version20000Date20201109081919' => $baseDir . '/core/Migrations/Version20000Date20201109081919.php',
     'OC\\Core\\Migrations\\Version20000Date20201111081915' => $baseDir . '/core/Migrations/Version20000Date20201111081915.php',
+    'OC\\Core\\Migrations\\Version21000Date20201120141228' => $baseDir . '/core/Migrations/Version21000Date20201120141228.php',
     'OC\\Core\\Notification\\CoreNotifier' => $baseDir . '/core/Notification/CoreNotifier.php',
     'OC\\Core\\Service\\LoginFlowV2Service' => $baseDir . '/core/Service/LoginFlowV2Service.php',
     'OC\\DB\\Adapter' => $baseDir . '/lib/private/DB/Adapter.php',
@@ -1261,8 +1262,14 @@ return array(
     'OC\\Repair\\NC20\\EncryptionMigration' => $baseDir . '/lib/private/Repair/NC20/EncryptionMigration.php',
     'OC\\Repair\\NC20\\ShippedDashboardEnable' => $baseDir . '/lib/private/Repair/NC20/ShippedDashboardEnable.php',
     'OC\\Repair\\OldGroupMembershipShares' => $baseDir . '/lib/private/Repair/OldGroupMembershipShares.php',
+    'OC\\Repair\\Owncloud\\CleanPreviews' => $baseDir . '/lib/private/Repair/Owncloud/CleanPreviews.php',
+    'OC\\Repair\\Owncloud\\CleanPreviewsBackgroundJob' => $baseDir . '/lib/private/Repair/Owncloud/CleanPreviewsBackgroundJob.php',
     'OC\\Repair\\Owncloud\\DropAccountTermsTable' => $baseDir . '/lib/private/Repair/Owncloud/DropAccountTermsTable.php',
+    'OC\\Repair\\Owncloud\\InstallCoreBundle' => $baseDir . '/lib/private/Repair/Owncloud/InstallCoreBundle.php',
+    'OC\\Repair\\Owncloud\\MoveAvatars' => $baseDir . '/lib/private/Repair/Owncloud/MoveAvatars.php',
+    'OC\\Repair\\Owncloud\\MoveAvatarsBackgroundJob' => $baseDir . '/lib/private/Repair/Owncloud/MoveAvatarsBackgroundJob.php',
     'OC\\Repair\\Owncloud\\SaveAccountsTableData' => $baseDir . '/lib/private/Repair/Owncloud/SaveAccountsTableData.php',
+    'OC\\Repair\\Owncloud\\UpdateLanguageCodes' => $baseDir . '/lib/private/Repair/Owncloud/UpdateLanguageCodes.php',
     'OC\\Repair\\RemoveLinkShares' => $baseDir . '/lib/private/Repair/RemoveLinkShares.php',
     'OC\\Repair\\RepairInvalidShares' => $baseDir . '/lib/private/Repair/RepairInvalidShares.php',
     'OC\\Repair\\RepairMimeTypes' => $baseDir . '/lib/private/Repair/RepairMimeTypes.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 0dc5fcebdf..9f36d5828c 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -953,6 +953,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\Core\\Migrations\\Version20000Date20201109081918' => __DIR__ . '/../../..' . '/core/Migrations/Version20000Date20201109081918.php',
         'OC\\Core\\Migrations\\Version20000Date20201109081919' => __DIR__ . '/../../..' . '/core/Migrations/Version20000Date20201109081919.php',
         'OC\\Core\\Migrations\\Version20000Date20201111081915' => __DIR__ . '/../../..' . '/core/Migrations/Version20000Date20201111081915.php',
+        'OC\\Core\\Migrations\\Version21000Date20201120141228' => __DIR__ . '/../../..' . '/core/Migrations/Version21000Date20201120141228.php',
         'OC\\Core\\Notification\\CoreNotifier' => __DIR__ . '/../../..' . '/core/Notification/CoreNotifier.php',
         'OC\\Core\\Service\\LoginFlowV2Service' => __DIR__ . '/../../..' . '/core/Service/LoginFlowV2Service.php',
         'OC\\DB\\Adapter' => __DIR__ . '/../../..' . '/lib/private/DB/Adapter.php',
@@ -1290,8 +1291,14 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\Repair\\NC20\\EncryptionMigration' => __DIR__ . '/../../..' . '/lib/private/Repair/NC20/EncryptionMigration.php',
         'OC\\Repair\\NC20\\ShippedDashboardEnable' => __DIR__ . '/../../..' . '/lib/private/Repair/NC20/ShippedDashboardEnable.php',
         'OC\\Repair\\OldGroupMembershipShares' => __DIR__ . '/../../..' . '/lib/private/Repair/OldGroupMembershipShares.php',
+        'OC\\Repair\\Owncloud\\CleanPreviews' => __DIR__ . '/../../..' . '/lib/private/Repair/Owncloud/CleanPreviews.php',
+        'OC\\Repair\\Owncloud\\CleanPreviewsBackgroundJob' => __DIR__ . '/../../..' . '/lib/private/Repair/Owncloud/CleanPreviewsBackgroundJob.php',
         'OC\\Repair\\Owncloud\\DropAccountTermsTable' => __DIR__ . '/../../..' . '/lib/private/Repair/Owncloud/DropAccountTermsTable.php',
+        'OC\\Repair\\Owncloud\\InstallCoreBundle' => __DIR__ . '/../../..' . '/lib/private/Repair/Owncloud/InstallCoreBundle.php',
+        'OC\\Repair\\Owncloud\\MoveAvatars' => __DIR__ . '/../../..' . '/lib/private/Repair/Owncloud/MoveAvatars.php',
+        'OC\\Repair\\Owncloud\\MoveAvatarsBackgroundJob' => __DIR__ . '/../../..' . '/lib/private/Repair/Owncloud/MoveAvatarsBackgroundJob.php',
         'OC\\Repair\\Owncloud\\SaveAccountsTableData' => __DIR__ . '/../../..' . '/lib/private/Repair/Owncloud/SaveAccountsTableData.php',
+        'OC\\Repair\\Owncloud\\UpdateLanguageCodes' => __DIR__ . '/../../..' . '/lib/private/Repair/Owncloud/UpdateLanguageCodes.php',
         'OC\\Repair\\RemoveLinkShares' => __DIR__ . '/../../..' . '/lib/private/Repair/RemoveLinkShares.php',
         'OC\\Repair\\RepairInvalidShares' => __DIR__ . '/../../..' . '/lib/private/Repair/RepairInvalidShares.php',
         'OC\\Repair\\RepairMimeTypes' => __DIR__ . '/../../..' . '/lib/private/Repair/RepairMimeTypes.php',
diff --git a/lib/private/DB/MigrationService.php b/lib/private/DB/MigrationService.php
index cd0280162d..33a11589eb 100644
--- a/lib/private/DB/MigrationService.php
+++ b/lib/private/DB/MigrationService.php
@@ -124,6 +124,11 @@ class MigrationService {
 			return false;
 		}
 
+		if ($this->connection->tableExists('migrations') && \OC::$server->getConfig()->getAppValue('core', 'vendor', '') !== 'owncloud') {
+			$this->migrationTableCreated = true;
+			return false;
+		}
+
 		$schema = new SchemaWrapper($this->connection);
 
 		/**
diff --git a/lib/private/Repair.php b/lib/private/Repair.php
index 61857285f3..f1fd645741 100644
--- a/lib/private/Repair.php
+++ b/lib/private/Repair.php
@@ -34,6 +34,7 @@
 
 namespace OC;
 
+use OC\App\AppStore\Bundles\BundleFetcher;
 use OC\Avatar\AvatarManager;
 use OC\Repair\AddCleanupUpdaterBackupsJob;
 use OC\Repair\CleanTags;
@@ -41,7 +42,11 @@ use OC\Repair\ClearFrontendCaches;
 use OC\Repair\ClearGeneratedAvatarCache;
 use OC\Repair\Collation;
 use OC\Repair\MoveUpdaterStepFile;
+use OC\Repair\Owncloud\CleanPreviews;
 use OC\Repair\NC11\FixMountStorages;
+use OC\Repair\Owncloud\MoveAvatars;
+use OC\Repair\Owncloud\InstallCoreBundle;
+use OC\Repair\Owncloud\UpdateLanguageCodes;
 use OC\Repair\NC13\AddLogRotateJob;
 use OC\Repair\NC14\AddPreviewBackgroundCleanupJob;
 use OC\Repair\NC16\AddClenupLoginFlowV2BackgroundJob;
@@ -148,7 +153,22 @@ class Repair implements IOutput {
 			new CleanTags(\OC::$server->getDatabaseConnection(), \OC::$server->getUserManager()),
 			new RepairInvalidShares(\OC::$server->getConfig(), \OC::$server->getDatabaseConnection()),
 			new MoveUpdaterStepFile(\OC::$server->getConfig()),
+			new MoveAvatars(
+				\OC::$server->getJobList(),
+				\OC::$server->getConfig()
+			),
+			new CleanPreviews(
+				\OC::$server->getJobList(),
+				\OC::$server->getUserManager(),
+				\OC::$server->getConfig()
+			),
 			new FixMountStorages(\OC::$server->getDatabaseConnection()),
+			new UpdateLanguageCodes(\OC::$server->getDatabaseConnection(), \OC::$server->getConfig()),
+			new InstallCoreBundle(
+				\OC::$server->query(BundleFetcher::class),
+				\OC::$server->getConfig(),
+				\OC::$server->query(Installer::class)
+			),
 			new AddLogRotateJob(\OC::$server->getJobList()),
 			new ClearFrontendCaches(\OC::$server->getMemCacheFactory(), \OC::$server->query(SCSSCacher::class), \OC::$server->query(JSCombiner::class)),
 			new ClearGeneratedAvatarCache(\OC::$server->getConfig(), \OC::$server->query(AvatarManager::class)),
diff --git a/lib/private/Repair/Owncloud/CleanPreviews.php b/lib/private/Repair/Owncloud/CleanPreviews.php
new file mode 100644
index 0000000000..5c183451d6
--- /dev/null
+++ b/lib/private/Repair/Owncloud/CleanPreviews.php
@@ -0,0 +1,73 @@
+<?php
+/**
+ * @copyright 2016 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OC\Repair\Owncloud;
+
+use OCP\BackgroundJob\IJobList;
+use OCP\IConfig;
+use OCP\IUser;
+use OCP\IUserManager;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+
+class CleanPreviews implements IRepairStep {
+
+	/** @var IJobList */
+	private $jobList;
+
+	/** @var IUserManager */
+	private $userManager;
+
+	/** @var IConfig */
+	private $config;
+
+	/**
+	 * MoveAvatars constructor.
+	 *
+	 * @param IJobList $jobList
+	 * @param IUserManager $userManager
+	 * @param IConfig $config
+	 */
+	public function __construct(IJobList $jobList,
+								IUserManager $userManager,
+								IConfig $config) {
+		$this->jobList = $jobList;
+		$this->userManager = $userManager;
+		$this->config = $config;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getName() {
+		return 'Add preview cleanup background jobs';
+	}
+
+	public function run(IOutput $output) {
+		if (!$this->config->getAppValue('core', 'previewsCleanedUp', false)) {
+			$this->userManager->callForSeenUsers(function (IUser $user) {
+				$this->jobList->add(CleanPreviewsBackgroundJob::class, ['uid' => $user->getUID()]);
+			});
+			$this->config->setAppValue('core', 'previewsCleanedUp', '1');
+		}
+	}
+}
diff --git a/lib/private/Repair/Owncloud/CleanPreviewsBackgroundJob.php b/lib/private/Repair/Owncloud/CleanPreviewsBackgroundJob.php
new file mode 100644
index 0000000000..e8d89c9c7a
--- /dev/null
+++ b/lib/private/Repair/Owncloud/CleanPreviewsBackgroundJob.php
@@ -0,0 +1,132 @@
+<?php
+/**
+ * @copyright 2016 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OC\Repair\Owncloud;
+
+use OC\BackgroundJob\QueuedJob;
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\BackgroundJob\IJobList;
+use OCP\Files\Folder;
+use OCP\Files\IRootFolder;
+use OCP\Files\NotFoundException;
+use OCP\Files\NotPermittedException;
+use OCP\ILogger;
+use OCP\IUserManager;
+
+class CleanPreviewsBackgroundJob extends QueuedJob {
+	/** @var IRootFolder */
+	private $rootFolder;
+
+	/** @var ILogger */
+	private $logger;
+
+	/** @var IJobList */
+	private $jobList;
+
+	/** @var ITimeFactory */
+	private $timeFactory;
+
+	/** @var IUserManager */
+	private $userManager;
+
+	/**
+	 * CleanPreviewsBackgroundJob constructor.
+	 *
+	 * @param IRootFolder $rootFolder
+	 * @param ILogger $logger
+	 * @param IJobList $jobList
+	 * @param ITimeFactory $timeFactory
+	 * @param IUserManager $userManager
+	 */
+	public function __construct(IRootFolder $rootFolder,
+								ILogger $logger,
+								IJobList $jobList,
+								ITimeFactory $timeFactory,
+								IUserManager $userManager) {
+		$this->rootFolder = $rootFolder;
+		$this->logger = $logger;
+		$this->jobList = $jobList;
+		$this->timeFactory = $timeFactory;
+		$this->userManager = $userManager;
+	}
+
+	public function run($arguments) {
+		$uid = $arguments['uid'];
+		if (!$this->userManager->userExists($uid)) {
+			$this->logger->info('User no longer exists, skip user ' . $uid);
+			return;
+		}
+		$this->logger->info('Started preview cleanup for ' . $uid);
+		$empty = $this->cleanupPreviews($uid);
+
+		if (!$empty) {
+			$this->jobList->add(self::class, ['uid' => $uid]);
+			$this->logger->info('New preview cleanup scheduled for ' . $uid);
+		} else {
+			$this->logger->info('Preview cleanup done for ' . $uid);
+		}
+	}
+
+	/**
+	 * @param $uid
+	 * @return bool
+	 */
+	private function cleanupPreviews($uid) {
+		try {
+			$userFolder = $this->rootFolder->getUserFolder($uid);
+		} catch (NotFoundException $e) {
+			return true;
+		}
+
+		$userRoot = $userFolder->getParent();
+
+		try {
+			/** @var Folder $thumbnailFolder */
+			$thumbnailFolder = $userRoot->get('thumbnails');
+		} catch (NotFoundException $e) {
+			return true;
+		}
+
+		$thumbnails = $thumbnailFolder->getDirectoryListing();
+
+		$start = $this->timeFactory->getTime();
+		foreach ($thumbnails as $thumbnail) {
+			try {
+				$thumbnail->delete();
+			} catch (NotPermittedException $e) {
+				// Ignore
+			}
+
+			if (($this->timeFactory->getTime() - $start) > 15) {
+				return false;
+			}
+		}
+
+		try {
+			$thumbnailFolder->delete();
+		} catch (NotPermittedException $e) {
+			// Ignore
+		}
+
+		return true;
+	}
+}
diff --git a/lib/private/Repair/Owncloud/InstallCoreBundle.php b/lib/private/Repair/Owncloud/InstallCoreBundle.php
new file mode 100644
index 0000000000..6d07ec9b96
--- /dev/null
+++ b/lib/private/Repair/Owncloud/InstallCoreBundle.php
@@ -0,0 +1,80 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Lukas Reschke <lukas@statuscode.ch>
+ *
+ * @author Lukas Reschke <lukas@statuscode.ch>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Repair\Owncloud;
+
+use OC\App\AppStore\Bundles\BundleFetcher;
+use OC\Installer;
+use OCP\IConfig;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+
+class InstallCoreBundle implements IRepairStep {
+	/** @var BundleFetcher */
+	private $bundleFetcher;
+	/** @var IConfig */
+	private $config;
+	/** @var Installer */
+	private $installer;
+
+	/**
+	 * @param BundleFetcher $bundleFetcher
+	 * @param IConfig $config
+	 * @param Installer $installer
+	 */
+	public function __construct(BundleFetcher $bundleFetcher,
+								IConfig $config,
+								Installer $installer) {
+		$this->bundleFetcher = $bundleFetcher;
+		$this->config = $config;
+		$this->installer = $installer;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function getName() {
+		return 'Install new core bundle components';
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function run(IOutput $output) {
+		$versionFromBeforeUpdate = $this->config->getSystemValue('version', '0.0.0');
+
+		if (version_compare($versionFromBeforeUpdate, '12.0.0.14', '>')) {
+			return;
+		}
+
+		$defaultBundle = $this->bundleFetcher->getDefaultInstallationBundle();
+		foreach ($defaultBundle as $bundle) {
+			try {
+				$this->installer->installAppBundle($bundle);
+				$output->info('Successfully installed core app bundle.');
+			} catch (\Exception $e) {
+				$output->warning('Could not install core app bundle: ' . $e->getMessage());
+			}
+		}
+	}
+}
diff --git a/lib/private/Repair/Owncloud/MoveAvatars.php b/lib/private/Repair/Owncloud/MoveAvatars.php
new file mode 100644
index 0000000000..53f3097aee
--- /dev/null
+++ b/lib/private/Repair/Owncloud/MoveAvatars.php
@@ -0,0 +1,73 @@
+<?php
+/**
+ * @copyright 2016 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OC\Repair\Owncloud;
+
+use OCP\BackgroundJob\IJobList;
+use OCP\IConfig;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+
+class MoveAvatars implements IRepairStep {
+
+	/** @var IJobList */
+	private $jobList;
+
+	/** @var IConfig */
+	private $config;
+
+	/**
+	 * MoveAvatars constructor.
+	 *
+	 * @param IJobList $jobList
+	 * @param IConfig $config
+	 */
+	public function __construct(IJobList $jobList,
+								IConfig $config) {
+		$this->jobList = $jobList;
+		$this->config = $config;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getName() {
+		return 'Add move avatar background job';
+	}
+
+	public function run(IOutput $output) {
+		// only run once
+		if ($this->config->getAppValue('core', 'moveavatarsdone') === 'yes') {
+			$output->info('Repair step already executed');
+			return;
+		}
+		if ($this->config->getSystemValue('enable_avatars', true) === false) {
+			$output->info('Avatars are disabled');
+		} else {
+			$output->info('Add background job');
+			$this->jobList->add(MoveAvatarsBackgroundJob::class);
+			// if all were done, no need to redo the repair during next upgrade
+			$this->config->setAppValue('core', 'moveavatarsdone', 'yes');
+		}
+	}
+}
diff --git a/lib/private/Repair/Owncloud/MoveAvatarsBackgroundJob.php b/lib/private/Repair/Owncloud/MoveAvatarsBackgroundJob.php
new file mode 100644
index 0000000000..ec076d116c
--- /dev/null
+++ b/lib/private/Repair/Owncloud/MoveAvatarsBackgroundJob.php
@@ -0,0 +1,116 @@
+<?php
+/**
+ * @copyright 2016 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Joas Schilling <coding@schilljs.com>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OC\Repair\Owncloud;
+
+use OC\BackgroundJob\QueuedJob;
+use OCP\Files\IRootFolder;
+use OCP\Files\NotFoundException;
+use OCP\Files\Storage;
+use OCP\IAvatarManager;
+use OCP\IUser;
+use OCP\IUserManager;
+use Psr\Log\LoggerInterface;
+
+class MoveAvatarsBackgroundJob extends QueuedJob {
+
+	/** @var IUserManager */
+	private $userManager;
+
+	/** @var LoggerInterface */
+	private $logger;
+
+	/** @var IAvatarManager */
+	private $avatarManager;
+
+	/** @var Storage */
+	private $owncloudAvatarStorage;
+
+	public function __construct(IUserManager $userManager, LoggerInterface $logger, IAvatarManager $avatarManager, IRootFolder $rootFolder) {
+		$this->userManager = $userManager;
+		$this->logger = $logger;
+		$this->avatarManager = $avatarManager;
+		try {
+			$this->owncloudAvatarStorage = $rootFolder->get('avatars')->getStorage();
+		} catch (\Exception $e) {
+		}
+	}
+
+	public function run($arguments) {
+		$this->logger->info('Started migrating avatars to AppData folder');
+		$this->moveAvatars();
+		$this->logger->info('All avatars migrated to AppData folder');
+	}
+
+	private function moveAvatars(): void {
+		if (!$this->owncloudAvatarStorage) {
+			$this->logger->info('No legacy avatars available, skipping migration');
+			return;
+		}
+
+		$counter = 0;
+		$this->userManager->callForSeenUsers(function (IUser $user) use ($counter) {
+			$uid = $user->getUID();
+
+			$path = 'avatars/' . $this->buildOwnCloudAvatarPath($uid);
+			$avatar = $this->avatarManager->getAvatar($uid);
+			try {
+				$avatarPath = $path . '/avatar.' . $this->getExtension($path);
+				$resource = $this->owncloudAvatarStorage->fopen($avatarPath, 'r');
+				if ($resource) {
+					$avatar->set($resource);
+					fclose($resource);
+				} else {
+					throw new \Exception('Failed to open old avatar file for reading');
+				}
+			} catch (NotFoundException $e) {
+				// In case there is no avatar we can just skip
+			} catch (\Throwable $e) {
+				$this->logger->error('Failed to migrate avatar for user ' . $uid, ['exception' => $e]);
+			}
+
+			$counter++;
+			if ($counter % 100 === 0) {
+				$this->logger->info('{amount} avatars migrated', ['amount' => $counter]);
+			}
+		});
+	}
+
+	/**
+	 * @throws NotFoundException
+	 */
+	private function getExtension(string $path): string {
+		if ($this->owncloudAvatarStorage->file_exists("{$path}/avatar.jpg")) {
+			return 'jpg';
+		}
+		if ($this->owncloudAvatarStorage->file_exists("{$path}/avatar.png")) {
+			return 'png';
+		}
+		throw new NotFoundException("{$path}/avatar.jpg|png");
+	}
+
+	protected function buildOwnCloudAvatarPath(string $userId): string {
+		return substr_replace(substr_replace(md5($userId), '/', 4, 0), '/', 2, 0);
+	}
+}
diff --git a/lib/private/Repair/Owncloud/SaveAccountsTableData.php b/lib/private/Repair/Owncloud/SaveAccountsTableData.php
index 6ca46934d7..89c331a7d7 100644
--- a/lib/private/Repair/Owncloud/SaveAccountsTableData.php
+++ b/lib/private/Repair/Owncloud/SaveAccountsTableData.php
@@ -78,6 +78,15 @@ class SaveAccountsTableData implements IRepairStep {
 			$numUsers = $this->runStep($offset);
 		}
 
+		// oc_persistent_locks will be removed later on anyways so we can just drop and ignore any foreign key constraints here
+		$tableName = $this->config->getSystemValue('dbtableprefix', 'oc_') . 'persistent_locks';
+		$schema = $this->db->createSchema();
+		$table = $schema->getTable($tableName);
+		foreach ($table->getForeignKeys() as $foreignKey) {
+			$table->removeForeignKey($foreignKey->getName());
+		}
+		$this->db->migrateToSchema($schema);
+
 		// Remove the table
 		if ($this->hasForeignKeyOnPersistentLocks) {
 			$this->db->dropTable('persistent_locks');
diff --git a/lib/private/Repair/Owncloud/UpdateLanguageCodes.php b/lib/private/Repair/Owncloud/UpdateLanguageCodes.php
new file mode 100644
index 0000000000..b7da0b0052
--- /dev/null
+++ b/lib/private/Repair/Owncloud/UpdateLanguageCodes.php
@@ -0,0 +1,90 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016 Morris Jobke <hey@morrisjobke.de>
+ *
+ * @author Joas Schilling <coding@schilljs.com>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Repair\Owncloud;
+
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\IConfig;
+use OCP\IDBConnection;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+
+class UpdateLanguageCodes implements IRepairStep {
+	/** @var IDBConnection */
+	private $connection;
+
+	/** @var IConfig */
+	private $config;
+
+	/**
+	 * @param IDBConnection $connection
+	 * @param IConfig $config
+	 */
+	public function __construct(IDBConnection $connection,
+								IConfig $config) {
+		$this->connection = $connection;
+		$this->config = $config;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function getName() {
+		return 'Repair language codes';
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function run(IOutput $output) {
+		$versionFromBeforeUpdate = $this->config->getSystemValue('version', '0.0.0');
+
+		if (version_compare($versionFromBeforeUpdate, '12.0.0.13', '>')) {
+			return;
+		}
+
+		$languages = [
+			'bg_BG' => 'bg',
+			'cs_CZ' => 'cs',
+			'fi_FI' => 'fi',
+			'hu_HU' => 'hu',
+			'nb_NO' => 'nb',
+			'sk_SK' => 'sk',
+			'th_TH' => 'th',
+		];
+
+		foreach ($languages as $oldCode => $newCode) {
+			$qb = $this->connection->getQueryBuilder();
+
+			$affectedRows = $qb->update('preferences')
+				->set('configvalue', $qb->createNamedParameter($newCode))
+				->where($qb->expr()->eq('appid', $qb->createNamedParameter('core')))
+				->andWhere($qb->expr()->eq('configkey', $qb->createNamedParameter('lang')))
+				->andWhere($qb->expr()->eq('configvalue', $qb->createNamedParameter($oldCode), IQueryBuilder::PARAM_STR))
+				->execute();
+
+			$output->info('Changed ' . $affectedRows . ' setting(s) from "' . $oldCode . '" to "' . $newCode . '" in preferences table.');
+		}
+	}
+}
diff --git a/lib/private/Security/Bruteforce/Capabilities.php b/lib/private/Security/Bruteforce/Capabilities.php
index eab55db1c9..fcf05efbd7 100644
--- a/lib/private/Security/Bruteforce/Capabilities.php
+++ b/lib/private/Security/Bruteforce/Capabilities.php
@@ -46,6 +46,10 @@ class Capabilities implements IPublicCapability {
 	}
 
 	public function getCapabilities() {
+		if (version_compare(\OC::$server->getConfig()->getSystemValue('version', '0.0.0.0'), '12.0.0.0', '<')) {
+			return [];
+		}
+
 		return [
 			'bruteforce' => [
 				'delay' => $this->throttler->getDelay($this->request->getRemoteAddress())
diff --git a/lib/private/Updater.php b/lib/private/Updater.php
index 4b5d02aeb6..3bf2cb1b6f 100644
--- a/lib/private/Updater.php
+++ b/lib/private/Updater.php
@@ -192,8 +192,12 @@ class Updater extends BasicEmitter {
 		$currentVendor = $this->config->getAppValue('core', 'vendor', '');
 
 		// Vendor was not set correctly on install, so we have to white-list known versions
-		if ($currentVendor === '' && isset($allowedPreviousVersions['owncloud'][$oldVersion])) {
+		if ($currentVendor === '' && (
+			isset($allowedPreviousVersions['owncloud'][$oldVersion]) ||
+			isset($allowedPreviousVersions['owncloud'][$majorMinor])
+		)) {
 			$currentVendor = 'owncloud';
+			$this->config->setAppValue('core', 'vendor', $currentVendor);
 		}
 
 		if ($currentVendor === 'nextcloud') {
diff --git a/tests/Test/Repair/Owncloud/CleanPreviewsBackgroundJobTest.php b/tests/Test/Repair/Owncloud/CleanPreviewsBackgroundJobTest.php
new file mode 100644
index 0000000000..267f01ca43
--- /dev/null
+++ b/tests/Test/Repair/Owncloud/CleanPreviewsBackgroundJobTest.php
@@ -0,0 +1,245 @@
+<?php
+/**
+ * @copyright 2016, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace Test\Repair\Owncloud;
+
+use OC\Repair\Owncloud\CleanPreviewsBackgroundJob;
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\BackgroundJob\IJobList;
+use OCP\Files\Folder;
+use OCP\Files\IRootFolder;
+use OCP\Files\NotFoundException;
+use OCP\Files\NotPermittedException;
+use OCP\ILogger;
+use OCP\IUserManager;
+use Test\TestCase;
+
+class CleanPreviewsBackgroundJobTest extends TestCase {
+	/** @var IRootFolder|\PHPUnit_Framework_MockObject_MockObject */
+	private $rootFolder;
+
+	/** @var ILogger|\PHPUnit_Framework_MockObject_MockObject */
+	private $logger;
+
+	/** @var IJobList|\PHPUnit_Framework_MockObject_MockObject */
+	private $jobList;
+
+	/** @var ITimeFactory|\PHPUnit_Framework_MockObject_MockObject */
+	private $timeFactory;
+
+	/** @var CleanPreviewsBackgroundJob */
+	private $job;
+
+	/** @var  IUserManager|\PHPUnit_Framework_MockObject_MockObject */
+	private $userManager;
+
+	public function setUp() {
+		parent::setUp();
+
+		$this->rootFolder = $this->createMock(IRootFolder::class);
+		$this->logger = $this->createMock(ILogger::class);
+		$this->jobList = $this->createMock(IJobList::class);
+		$this->timeFactory = $this->createMock(ITimeFactory::class);
+		$this->userManager = $this->createMock(IUserManager::class);
+
+		$this->userManager->expects($this->any())->method('userExists')->willReturn(true);
+
+		$this->job = new CleanPreviewsBackgroundJob(
+			$this->rootFolder,
+			$this->logger,
+			$this->jobList,
+			$this->timeFactory,
+			$this->userManager
+		);
+	}
+
+	public function testCleanupPreviewsUnfinished() {
+		$userFolder = $this->createMock(Folder::class);
+		$userRoot = $this->createMock(Folder::class);
+		$thumbnailFolder = $this->createMock(Folder::class);
+
+		$this->rootFolder->method('getUserFolder')
+			->with($this->equalTo('myuid'))
+			->willReturn($userFolder);
+
+		$userFolder->method('getParent')->willReturn($userRoot);
+
+		$userRoot->method('get')
+			->with($this->equalTo('thumbnails'))
+			->willReturn($thumbnailFolder);
+
+		$previewFolder1 = $this->createMock(Folder::class);
+
+		$previewFolder1->expects($this->once())
+			->method('delete');
+
+		$thumbnailFolder->method('getDirectoryListing')
+			->willReturn([$previewFolder1]);
+		$thumbnailFolder->expects($this->never())
+			->method('delete');
+
+		$this->timeFactory->method('getTime')
+			->will($this->onConsecutiveCalls(100, 200));
+
+		$this->jobList->expects($this->once())
+			->method('add')
+			->with(
+				$this->equalTo(CleanPreviewsBackgroundJob::class),
+				$this->equalTo(['uid' => 'myuid'])
+			);
+
+		$this->logger->expects($this->at(0))
+			->method('info')
+			->with($this->equalTo('Started preview cleanup for myuid'));
+		$this->logger->expects($this->at(1))
+			->method('info')
+			->with($this->equalTo('New preview cleanup scheduled for myuid'));
+
+		$this->job->run(['uid' => 'myuid']);
+	}
+
+	public function testCleanupPreviewsFinished() {
+		$userFolder = $this->createMock(Folder::class);
+		$userRoot = $this->createMock(Folder::class);
+		$thumbnailFolder = $this->createMock(Folder::class);
+
+		$this->rootFolder->method('getUserFolder')
+			->with($this->equalTo('myuid'))
+			->willReturn($userFolder);
+
+		$userFolder->method('getParent')->willReturn($userRoot);
+
+		$userRoot->method('get')
+			->with($this->equalTo('thumbnails'))
+			->willReturn($thumbnailFolder);
+
+		$previewFolder1 = $this->createMock(Folder::class);
+
+		$previewFolder1->expects($this->once())
+			->method('delete');
+
+		$thumbnailFolder->method('getDirectoryListing')
+			->willReturn([$previewFolder1]);
+
+		$this->timeFactory->method('getTime')
+			->will($this->onConsecutiveCalls(100, 101));
+
+		$this->jobList->expects($this->never())
+			->method('add');
+
+		$this->logger->expects($this->at(0))
+			->method('info')
+			->with($this->equalTo('Started preview cleanup for myuid'));
+		$this->logger->expects($this->at(1))
+			->method('info')
+			->with($this->equalTo('Preview cleanup done for myuid'));
+
+		$thumbnailFolder->expects($this->once())
+			->method('delete');
+
+		$this->job->run(['uid' => 'myuid']);
+	}
+
+
+	public function testNoUserFolder() {
+		$this->rootFolder->method('getUserFolder')
+			->with($this->equalTo('myuid'))
+			->willThrowException(new NotFoundException());
+
+		$this->logger->expects($this->at(0))
+			->method('info')
+			->with($this->equalTo('Started preview cleanup for myuid'));
+		$this->logger->expects($this->at(1))
+			->method('info')
+			->with($this->equalTo('Preview cleanup done for myuid'));
+
+		$this->job->run(['uid' => 'myuid']);
+	}
+
+	public function testNoThumbnailFolder() {
+		$userFolder = $this->createMock(Folder::class);
+		$userRoot = $this->createMock(Folder::class);
+
+		$this->rootFolder->method('getUserFolder')
+			->with($this->equalTo('myuid'))
+			->willReturn($userFolder);
+
+		$userFolder->method('getParent')->willReturn($userRoot);
+
+		$userRoot->method('get')
+			->with($this->equalTo('thumbnails'))
+			->willThrowException(new NotFoundException());
+
+		$this->logger->expects($this->at(0))
+			->method('info')
+			->with($this->equalTo('Started preview cleanup for myuid'));
+		$this->logger->expects($this->at(1))
+			->method('info')
+			->with($this->equalTo('Preview cleanup done for myuid'));
+
+		$this->job->run(['uid' => 'myuid']);
+	}
+
+	public function testNotPermittedToDelete() {
+		$userFolder = $this->createMock(Folder::class);
+		$userRoot = $this->createMock(Folder::class);
+		$thumbnailFolder = $this->createMock(Folder::class);
+
+		$this->rootFolder->method('getUserFolder')
+			->with($this->equalTo('myuid'))
+			->willReturn($userFolder);
+
+		$userFolder->method('getParent')->willReturn($userRoot);
+
+		$userRoot->method('get')
+			->with($this->equalTo('thumbnails'))
+			->willReturn($thumbnailFolder);
+
+		$previewFolder1 = $this->createMock(Folder::class);
+
+		$previewFolder1->expects($this->once())
+			->method('delete')
+			->willThrowException(new NotPermittedException());
+
+		$thumbnailFolder->method('getDirectoryListing')
+			->willReturn([$previewFolder1]);
+
+		$this->timeFactory->method('getTime')
+			->will($this->onConsecutiveCalls(100, 101));
+
+		$this->jobList->expects($this->never())
+			->method('add');
+
+		$this->logger->expects($this->at(0))
+			->method('info')
+			->with($this->equalTo('Started preview cleanup for myuid'));
+		$this->logger->expects($this->at(1))
+			->method('info')
+			->with($this->equalTo('Preview cleanup done for myuid'));
+
+		$thumbnailFolder->expects($this->once())
+			->method('delete')
+			->willThrowException(new NotPermittedException());
+
+		$this->job->run(['uid' => 'myuid']);
+	}
+}
diff --git a/tests/Test/Repair/Owncloud/CleanPreviewsTest.php b/tests/Test/Repair/Owncloud/CleanPreviewsTest.php
new file mode 100644
index 0000000000..131b80517f
--- /dev/null
+++ b/tests/Test/Repair/Owncloud/CleanPreviewsTest.php
@@ -0,0 +1,134 @@
+<?php
+/**
+ * @copyright 2016, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace Test\Repair\Owncloud;
+
+use OC\Repair\Owncloud\CleanPreviews;
+use OC\Repair\Owncloud\CleanPreviewsBackgroundJob;
+use OCP\BackgroundJob\IJobList;
+use OCP\IConfig;
+use OCP\IUser;
+use OCP\IUserManager;
+use OCP\Migration\IOutput;
+use Test\TestCase;
+
+class CleanPreviewsTest extends TestCase {
+
+
+	/** @var IJobList|\PHPUnit_Framework_MockObject_MockObject */
+	private $jobList;
+
+	/** @var IUserManager|\PHPUnit_Framework_MockObject_MockObject */
+	private $userManager;
+
+	/** @var IConfig|\PHPUnit_Framework_MockObject_MockObject */
+	private $config;
+
+	/** @var CleanPreviews */
+	private $repair;
+
+	public function setUp() {
+		parent::setUp();
+
+		$this->jobList = $this->createMock(IJobList::class);
+		$this->userManager = $this->createMock(IUserManager::class);
+		$this->config = $this->createMock(IConfig::class);
+
+		$this->repair = new CleanPreviews(
+			$this->jobList,
+			$this->userManager,
+			$this->config
+		);
+	}
+
+	public function testGetName() {
+		$this->assertSame('Add preview cleanup background jobs', $this->repair->getName());
+	}
+
+	public function testRun() {
+		$user1 = $this->createMock(IUser::class);
+		$user1->method('getUID')
+			->willReturn('user1');
+		$user2 = $this->createMock(IUser::class);
+		$user2->method('getUID')
+			->willReturn('user2');
+
+		$this->userManager->expects($this->once())
+			->method('callForSeenUsers')
+			->will($this->returnCallback(function (\Closure $function) use ($user1, $user2) {
+				$function($user1);
+				$function($user2);
+			}));
+
+		$this->jobList->expects($this->at(0))
+			->method('add')
+			->with(
+				$this->equalTo(CleanPreviewsBackgroundJob::class),
+				$this->equalTo(['uid' => 'user1'])
+			);
+
+		$this->jobList->expects($this->at(1))
+			->method('add')
+			->with(
+				$this->equalTo(CleanPreviewsBackgroundJob::class),
+				$this->equalTo(['uid' => 'user2'])
+			);
+
+		$this->config->expects($this->once())
+			->method('getAppValue')
+			->with(
+				$this->equalTo('core'),
+				$this->equalTo('previewsCleanedUp'),
+				$this->equalTo(false)
+			)->willReturn(false);
+		$this->config->expects($this->once())
+			->method('setAppValue')
+			->with(
+				$this->equalTo('core'),
+				$this->equalTo('previewsCleanedUp'),
+				$this->equalTo(1)
+			);
+
+		$this->repair->run($this->createMock(IOutput::class));
+	}
+
+
+	public function testRunAlreadyDoone() {
+		$this->userManager->expects($this->never())
+			->method($this->anything());
+
+		$this->jobList->expects($this->never())
+			->method($this->anything());
+
+		$this->config->expects($this->once())
+			->method('getAppValue')
+			->with(
+				$this->equalTo('core'),
+				$this->equalTo('previewsCleanedUp'),
+				$this->equalTo(false)
+			)->willReturn('1');
+		$this->config->expects($this->never())
+			->method('setAppValue');
+
+		$this->repair->run($this->createMock(IOutput::class));
+	}
+}
diff --git a/tests/Test/Repair/Owncloud/InstallCoreBundleTest.php b/tests/Test/Repair/Owncloud/InstallCoreBundleTest.php
new file mode 100644
index 0000000000..37163aee96
--- /dev/null
+++ b/tests/Test/Repair/Owncloud/InstallCoreBundleTest.php
@@ -0,0 +1,142 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Lukas Reschke <lukas@statuscode.ch>
+ *
+ * @author Lukas Reschke <lukas@statuscode.ch>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Test\Repair\Owncloud;
+
+use OC\App\AppStore\Bundles\Bundle;
+use OC\App\AppStore\Bundles\BundleFetcher;
+use OC\Installer;
+use OC\Repair\Owncloud\InstallCoreBundle;
+use OCP\IConfig;
+use OCP\Migration\IOutput;
+use Test\TestCase;
+
+class InstallCoreBundleTest extends TestCase {
+	/** @var BundleFetcher|\PHPUnit_Framework_MockObject_MockObject */
+	private $bundleFetcher;
+	/** @var IConfig|\PHPUnit_Framework_MockObject_MockObject */
+	private $config;
+	/** @var Installer|\PHPUnit_Framework_MockObject_MockObject */
+	private $installer;
+	/** @var InstallCoreBundle */
+	private $installCoreBundle;
+
+	public function setUp() {
+		parent::setUp();
+		$this->bundleFetcher = $this->createMock(BundleFetcher::class);
+		$this->config = $this->createMock(IConfig::class);
+		$this->installer = $this->createMock(Installer::class);
+
+		$this->installCoreBundle = new InstallCoreBundle(
+			$this->bundleFetcher,
+			$this->config,
+			$this->installer
+		);
+	}
+
+	public function testGetName() {
+		$this->assertSame('Install new core bundle components', $this->installCoreBundle->getName());
+	}
+
+	public function testRunOlder() {
+		$this->config
+			->expects($this->once())
+			->method('getSystemValue')
+			->with('version', '0.0.0')
+			->willReturn('12.0.0.15');
+		$this->bundleFetcher
+			->expects($this->never())
+			->method('getDefaultInstallationBundle');
+		/** @var IOutput|\PHPUnit_Framework_MockObject_MockObject $output */
+		$output = $this->createMock(IOutput::class);
+		$output
+			->expects($this->never())
+			->method('info');
+		$output
+			->expects($this->never())
+			->method('warning');
+
+		$this->installCoreBundle->run($output);
+	}
+
+	public function testRunWithException() {
+		$this->config
+			->expects($this->once())
+			->method('getSystemValue')
+			->with('version', '0.0.0')
+			->willReturn('12.0.0.14');
+		$bundle = $this->createMock(Bundle::class);
+		$this->bundleFetcher
+			->expects($this->once())
+			->method('getDefaultInstallationBundle')
+			->willReturn([
+				$bundle,
+			]);
+		$this->installer
+			->expects($this->once())
+			->method('installAppBundle')
+			->with($bundle)
+			->willThrowException(new \Exception('ExceptionText'));
+		/** @var IOutput|\PHPUnit_Framework_MockObject_MockObject $output */
+		$output = $this->createMock(IOutput::class);
+		$output
+			->expects($this->never())
+			->method('info');
+		$output
+			->expects($this->once())
+			->method('warning')
+			->with('Could not install core app bundle: ExceptionText');
+
+		$this->installCoreBundle->run($output);
+	}
+
+	public function testRun() {
+		$this->config
+			->expects($this->once())
+			->method('getSystemValue')
+			->with('version', '0.0.0')
+			->willReturn('12.0.0.14');
+		$bundle = $this->createMock(Bundle::class);
+		$this->bundleFetcher
+			->expects($this->once())
+			->method('getDefaultInstallationBundle')
+			->willReturn([
+				$bundle,
+			]);
+		$this->installer
+			->expects($this->once())
+			->method('installAppBundle')
+			->with($bundle);
+		/** @var IOutput|\PHPUnit_Framework_MockObject_MockObject $output */
+		$output = $this->createMock(IOutput::class);
+		$output
+			->expects($this->once())
+			->method('info')
+			->with('Successfully installed core app bundle.');
+		$output
+			->expects($this->never())
+			->method('warning');
+
+		$this->installCoreBundle->run($output);
+	}
+}
diff --git a/tests/Test/Repair/Owncloud/UpdateLanguageCodesTest.php b/tests/Test/Repair/Owncloud/UpdateLanguageCodesTest.php
new file mode 100644
index 0000000000..171b770119
--- /dev/null
+++ b/tests/Test/Repair/Owncloud/UpdateLanguageCodesTest.php
@@ -0,0 +1,175 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016 Morris Jobke <hey@morrisjobke.de>
+ *
+ * @author Morris Jobke <hey@morrisjobke.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Test\Repair\Owncloud;
+
+use OC\Repair\Owncloud\UpdateLanguageCodes;
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\IConfig;
+use OCP\Migration\IOutput;
+use Test\TestCase;
+
+/**
+ * Class UpdateLanguageCodesTest
+ *
+ * @group DB
+ *
+ * @package Test\Repair
+ */
+class UpdateLanguageCodesTest extends TestCase {
+	/** @var \OCP\IDBConnection */
+	protected $connection;
+
+	/** @var IConfig | \PHPUnit_Framework_MockObject_MockObject */
+	private $config;
+
+	protected function setUp() {
+		parent::setUp();
+
+		$this->connection = \OC::$server->getDatabaseConnection();
+		$this->config = $this->createMock(IConfig::class);
+	}
+
+	public function testRun() {
+		$users = [
+			['userid' => 'user1', 'configvalue' => 'fi_FI'],
+			['userid' => 'user2', 'configvalue' => 'de'],
+			['userid' => 'user3', 'configvalue' => 'fi'],
+			['userid' => 'user4', 'configvalue' => 'ja'],
+			['userid' => 'user5', 'configvalue' => 'bg_BG'],
+			['userid' => 'user6', 'configvalue' => 'ja'],
+			['userid' => 'user7', 'configvalue' => 'th_TH'],
+			['userid' => 'user8', 'configvalue' => 'th_TH'],
+		];
+
+		// insert test data
+		$qb = $this->connection->getQueryBuilder();
+		$qb->insert('preferences')
+				->values([
+					'userid' => $qb->createParameter('userid'),
+					'appid' => $qb->createParameter('appid'),
+					'configkey' => $qb->createParameter('configkey'),
+					'configvalue' => $qb->createParameter('configvalue'),
+				]);
+		foreach ($users as $user) {
+			$qb->setParameters([
+				'userid' => $user['userid'],
+				'appid' => 'core',
+				'configkey' => 'lang',
+				'configvalue' => $user['configvalue'],
+			])->execute();
+		}
+
+		// check if test data is written to DB
+		$qb = $this->connection->getQueryBuilder();
+		$result = $qb->select(['userid', 'configvalue'])
+			->from('preferences')
+			->where($qb->expr()->eq('appid', $qb->createNamedParameter('core')))
+			->andWhere($qb->expr()->eq('configkey', $qb->createNamedParameter('lang')))
+			->execute();
+
+		$rows = $result->fetchAll();
+		$result->closeCursor();
+
+		$this->assertSame($users, $rows, 'Asserts that the entries are the ones from the test data set');
+
+		/** @var IOutput|\PHPUnit_Framework_MockObject_MockObject $outputMock */
+		$outputMock = $this->createMock(IOutput::class);
+		$outputMock->expects($this->at(0))
+			->method('info')
+			->with('Changed 1 setting(s) from "bg_BG" to "bg" in preferences table.');
+		$outputMock->expects($this->at(1))
+			->method('info')
+			->with('Changed 0 setting(s) from "cs_CZ" to "cs" in preferences table.');
+		$outputMock->expects($this->at(2))
+			->method('info')
+			->with('Changed 1 setting(s) from "fi_FI" to "fi" in preferences table.');
+		$outputMock->expects($this->at(3))
+			->method('info')
+			->with('Changed 0 setting(s) from "hu_HU" to "hu" in preferences table.');
+		$outputMock->expects($this->at(4))
+			->method('info')
+			->with('Changed 0 setting(s) from "nb_NO" to "nb" in preferences table.');
+		$outputMock->expects($this->at(5))
+			->method('info')
+			->with('Changed 0 setting(s) from "sk_SK" to "sk" in preferences table.');
+		$outputMock->expects($this->at(6))
+			->method('info')
+			->with('Changed 2 setting(s) from "th_TH" to "th" in preferences table.');
+
+		$this->config->expects($this->once())
+			->method('getSystemValue')
+			->with('version', '0.0.0')
+			->willReturn('12.0.0.13');
+
+		// run repair step
+		$repair = new UpdateLanguageCodes($this->connection, $this->config);
+		$repair->run($outputMock);
+
+		// check if test data is correctly modified in DB
+		$qb = $this->connection->getQueryBuilder();
+		$result = $qb->select(['userid', 'configvalue'])
+			->from('preferences')
+			->where($qb->expr()->eq('appid', $qb->createNamedParameter('core')))
+			->andWhere($qb->expr()->eq('configkey', $qb->createNamedParameter('lang')))
+			->orderBy('userid')
+			->execute();
+
+		$rows = $result->fetchAll();
+		$result->closeCursor();
+
+		// value has changed for one user
+		$users[0]['configvalue'] = 'fi';
+		$users[4]['configvalue'] = 'bg';
+		$users[6]['configvalue'] = 'th';
+		$users[7]['configvalue'] = 'th';
+		$this->assertSame($users, $rows, 'Asserts that the entries are updated correctly.');
+
+		// remove test data
+		foreach ($users as $user) {
+			$qb = $this->connection->getQueryBuilder();
+			$qb->delete('preferences')
+				->where($qb->expr()->eq('userid', $qb->createNamedParameter($user['userid'])))
+				->andWhere($qb->expr()->eq('appid', $qb->createNamedParameter('core')))
+				->andWhere($qb->expr()->eq('configkey', $qb->createNamedParameter('lang')))
+				->andWhere($qb->expr()->eq('configvalue', $qb->createNamedParameter($user['configvalue']), IQueryBuilder::PARAM_STR))
+				->execute();
+		}
+	}
+
+	public function testSecondRun() {
+		/** @var IOutput|\PHPUnit_Framework_MockObject_MockObject $outputMock */
+		$outputMock = $this->createMock(IOutput::class);
+		$outputMock->expects($this->never())
+			->method('info');
+
+		$this->config->expects($this->once())
+			->method('getSystemValue')
+			->with('version', '0.0.0')
+			->willReturn('12.0.0.14');
+
+		// run repair step
+		$repair = new UpdateLanguageCodes($this->connection, $this->config);
+		$repair->run($outputMock);
+	}
+}
diff --git a/version.php b/version.php
index 677ac6d9d9..531e9be04c 100644
--- a/version.php
+++ b/version.php
@@ -40,6 +40,7 @@ $OC_VersionCanBeUpgradedFrom = [
 		'20.0' => true,
 	],
 	'owncloud' => [
+		'10.5' => true,
 	],
 ];