diff --git a/apps/files_external/lib/config.php b/apps/files_external/lib/config.php
index ebc83c7af8..2112266efc 100755
--- a/apps/files_external/lib/config.php
+++ b/apps/files_external/lib/config.php
@@ -524,17 +524,50 @@ class OC_Mount_Config {
 	 * check dependencies
 	 */
 	public static function checkDependencies() {
-		$txt='';
+		$dependencyMessages = array();
 		foreach (OC_Mount_Config::$backends as $class => $backend) {
 			if (isset($backend['has_dependencies']) and $backend['has_dependencies'] === true) {
 				$result = $class::checkDependencies();
-				if ($result !== true) {
-					$txt.=$result.'<br />';
+				if ($result !== true and OC_Mount_Config::findFirstSentence($dependencyMessages, $result) < 0) {
+					$dependencyMessages[] = $result;
 				}
 			}
 		}
 
-		return $txt;
+		if (count($dependencyMessages) > 0) {
+			return implode('<br />', $dependencyMessages);
+		}
+		return '';
+	}
+
+	/**
+	 * Finds the first string in an array that has the same first sentence (or part thereof)
+	 * as a given comparison string
+	 * @param $arr array An array of strings
+	 * @param $str string The string to find
+	 * @return int The position of the first occurrence or -1 if not found
+	 */
+	private static function findFirstSentence($arr, $str) {
+		foreach ($arr as $i => $item) {
+			$itemPos = strpos($item, '.');
+			$strPos = strpos($str, '.');
+
+			if ($itemPos < 0 && $strPos < 0) {
+				$itemPos = strpos($item, ',');
+				$strPos = strpos($str, ',');
+
+				if ($itemPos < 0 && $strPos < 0) {
+					$itemPos = strlen($item);
+					$strPos = strlen($str);
+				}
+			}
+
+			if ($itemPos === $strPos and strncasecmp($item, $str, $itemPos) === 0) {
+				return $i;
+			}
+		}
+
+		return -1;
 	}
 
 	/**
diff --git a/apps/files_external/lib/ftp.php b/apps/files_external/lib/ftp.php
index 43635f7f94..a6a775ff6d 100644
--- a/apps/files_external/lib/ftp.php
+++ b/apps/files_external/lib/ftp.php
@@ -25,7 +25,7 @@ class FTP extends \OC\Files\Storage\StreamWrapper{
 			return(true);
 		} else {
 			$l = new \OC_L10N('files_external');
-			return $l->t('<b>Warning:</b> The FTP support in PHP is not enabled or installed. Mounting of FTP shares is not possible. Please ask your system administrator to install it.');
+			return $l->t('<b>Note:</b> The FTP support in PHP is not enabled or installed. Mounting of FTP shares is not possible. Please ask your system administrator to install it.');
 		}
 	}
 
diff --git a/apps/files_external/lib/google.php b/apps/files_external/lib/google.php
index 936153b35a..cfb7005c4c 100644
--- a/apps/files_external/lib/google.php
+++ b/apps/files_external/lib/google.php
@@ -49,7 +49,7 @@ class Google extends \OC\Files\Storage\Common {
 			return true;
 		} else {
 			$l = new \OC_L10N('files_external');
-			return $l->t('<b>Warning:</b> The cURL support in PHP is not enabled or installed. Mounting of Google Drive is not possible. Please ask your system administrator to install it.');
+			return $l->t('<b>Note:</b> The cURL support in PHP is not enabled or installed. Mounting of Google Drive is not possible. Please ask your system administrator to install it.');
 		}
 	}
 
diff --git a/apps/files_external/lib/smb.php b/apps/files_external/lib/smb.php
index bfe494e867..6fb262323f 100644
--- a/apps/files_external/lib/smb.php
+++ b/apps/files_external/lib/smb.php
@@ -28,7 +28,7 @@ class SMB extends \OC\Files\Storage\StreamWrapper{
 			}
 		}
 		$l = new \OC_L10N('files_external');
-		return $l->t('<b>Warning:</b> "smbclient" is not installed. Mounting of CIFS/SMB shares is not possible. Please ask your system administrator to install it.');
+		return $l->t('<b>Note:</b> "smbclient" is not installed. Mounting of CIFS/SMB shares is not possible. Please ask your system administrator to install it.');
 	}
 
 	public function __construct($params) {
diff --git a/apps/files_external/lib/webdav.php b/apps/files_external/lib/webdav.php
index ac6663133d..0ea7a08504 100644
--- a/apps/files_external/lib/webdav.php
+++ b/apps/files_external/lib/webdav.php
@@ -31,7 +31,7 @@ class DAV extends \OC\Files\Storage\Common {
 			return true;
 		} else {
 			$l = new \OC_L10N('files_external');
-			return $l->t('<b>Warning:</b> The cURL support in PHP is not enabled or installed. Mounting of ownCloud / WebDAV is not possible. Please ask your system administrator to install it.');
+			return $l->t('<b>Note:</b> The cURL support in PHP is not enabled or installed. Mounting of ownCloud / WebDAV is not possible. Please ask your system administrator to install it.');
 		}
 	}