求助，DBUS出错，gedit不能保存文件到其它自有目录外的地方。

[tellno]

出错信息如下：
master@master-laptop:~$ sudo gedit /etc/apt/sources.list
Password:

(gedit:6322): libgnomevfs-WARNING **: Failed to open session DBUS connection: 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.
Volume monitoring will not work.
Launching a SCIM daemon with Socket FrontEnd...
Loading simple Config module ...
Creating backend ...
Loading socket FrontEnd module ...
Starting SCIM as daemon ...
GTK Panel of SCIM 1.4.4

libgnomevfs出错的后果：gedit的另存为保存位置选择界面与正常时不一样，而只能选择root用户（因为用的是sudo）的几个位置，其它mount分区不能显示出来。

如果不sudo编辑普通文件则没有此错误提示，保存位置也可选其它mount的分区，即是正常的。

请高人们（如eexpress）指点指点，先谢过了。。。。