我以root用户身份登录，sites-available/default的文件权限为755。
我无法以root用户身份在Gedit中打开默认文件。当我尝试这样做时，我收到以下错误：
(gedit:8167): EggSMClient-WARNING **: Failed to connect to the session manager: None of the authentication protocols specified are supported
(gedit:8167): WARNING: Could not connect to session bus