Index: typo3/sysext/install/updates/class.tx_coreupdates_migrateworkspaces.php
===================================================================
--- typo3/sysext/install/updates/class.tx_coreupdates_migrateworkspaces.php	(Revision 10141)
+++ typo3/sysext/install/updates/class.tx_coreupdates_migrateworkspaces.php	(Arbeitskopie)
@@ -100,7 +100,7 @@
 		$this->includeTCA();
 
 			// install version and workspace extension (especially when updating from very old TYPO3 versions
-		$this->installExtensions(array('extbase', 'fluid', 'version', 'workspaces'));
+		$this->installNecessaryExtensions(array('extbase', 'fluid', 'version', 'workspaces'));
 
 			// migrate all workspaces to support groups and be_users
 		if ($this->isOldStyleAdminFieldUsed()) {
@@ -143,23 +143,17 @@
 	}
 
 	/**
-	 * Install a extensions
+	 * Install extensions required for a complete workspaces setup
 	 *
-	 * @param	array		List of extension keys
-	 * @return	boolean	Determines whether this was successful or not
+	 * @param array $extensionKeys List of extension keys
+	 * @return void
 	 */
-	protected function installExtensions($extensionKeys) {
-		if (!is_array($extensionKeys)) {
-			return FALSE;
-		}
+	protected function installNecessaryExtensions(array $extensionKeys) {
 
-		$result = FALSE;
-		$extList = $this->addExtToList($extensionKeys);
-		if ($extList) {
-			$this->writeNewExtensionList($extList);
-			$result = TRUE;
+			// Install all necessary extensions
+		foreach ($extensionKeys as $extension) {
+			$this->installExtension($extension);
 		}
-		return $result;
 	}
 
 	/**