我的软件包管理器突然不能打开了，大家帮忙看看吧

[guogss]

gyc@gyc-laptop:~$ gnome-app-install
Xlib: extension "Generic Event Extension" missing on display ":0.0".
Xlib: extension "Generic Event Extension" missing on display ":0.0".
Xlib: extension "Generic Event Extension" missing on display ":0.0".
Xlib: extension "Generic Event Extension" missing on display ":0.0".
Xlib: extension "Generic Event Extension" missing on display ":0.0".
Xlib: extension "Generic Event Extension" missing on display ":0.0".
Traceback (most recent call last):
File "/usr/bin/gnome-app-install", line 30, in <module>
main()
File "/usr/lib/python2.6/dist-packages/AppInstall/activation.py", line 490, in main
from AppInstall import AppInstall
File "/usr/lib/python2.6/dist-packages/AppInstall/AppInstall.py", line 65, in <module>
import dbus.glib
File "/var/lib/python-support/python2.6/dbus/glib.py", line 37, in <module>
from dbus.mainloop.glib import DBusGMainLoop, threads_init
ImportError: No module named mainloop.glib