improved installation instructions

lib/util.php

@@ -25,7 +25,7 @@ class OC_Util {
 			$success=@mkdir($CONFIG_DATADIRECTORY_ROOT);
                         if(!$success) {
 				$tmpl = new OC_Template( '', 'error', 'guest' );
-				$tmpl->assign('errors',array(1=>array('error'=>"Can't create data directory (".$CONFIG_DATADIRECTORY_ROOT.")",'hint'=>"You can usually fix this by giving the webserver write access to the ownCloud directory '".OC::$SERVERROOT."' ")));
+				$tmpl->assign('errors',array(1=>array('error'=>"Can't create data directory (".$CONFIG_DATADIRECTORY_ROOT.")",'hint'=>"You can usually fix this by giving the webserver write access to the ownCloud directory '".OC::$SERVERROOT."' (in a terminal, use the command 'chown -R www-data:www-data /path/to/your/owncloud/install/data' ")));
 				$tmpl->printPage();
 				exit;
   			}