Debian GNU/Linux 8.2.0 64bit
# gvim /etc/fstab
(gvim:1657): GnomeUI-WARNING **: While connecting to session manager:
None of the authentication protocols specified are supported.
(gvim:1657): GConf-WARNING **: Client failed to connect to the D-BUS daemon:
Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
解決辦法：獲取root身份的時候用"su -"命令。