kenx@kenx-Aspire-4740:~$ sudo gedit /etc/apt/sources.list
(gedit:2385): Gtk-WARNING **: Attempting to store changes into
`/root/.local/share/recently-used.xbel', but failed: Failed to
create file '/root/.local/share/recently-used.xbel.2GTNMW': No such
file or directory
(gedit:2385): Gtk-WARNING **: Attempting to set the permissions of
`/root/.local/share/recently-used.xbel', but failed: No such file
or directory
http://forum.ubuntu.org.cn/viewtopic.php?f=86&t=335231
缺少这个路径，已经解决了，按照大神的指点
sudo mkdir -p /root/.local/share