import gtk出错，ubuntu好多菜单打不开

import gtk
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/var/lib/python-support/python2.5/gtk-2.0/gtk/__init__.py", line 48, in <module>
    from gtk import _gtk
  File "/usr/lib/python2.5/site-packages/cairo/__init__.py", line 1, in <module>
    from _cairo import *
ImportError: /usr/lib/python2.5/site-packages/cairo/_cairo.so: undefined symbol: cairo_clip_extents

好多菜单点击后没反应，在命令行执行出现以上错误。应该怎么处理？

谢谢大家～～

操作系统ubuntu 7.10