gufw error

[Peng Yu]

I got the following error when I run gufw. Does anybody know how to
fix the problem?

$ gufw
...
Traceback (most recent call last):
  File "/usr/share/gufw/gufw/gufw.py", line 21, in <module>
    from view.gufw  import Gufw
  File "/usr/share/gufw/gufw/view/gufw.py", line 19, in <module>
    from gi.repository import Gtk, Gdk, WebKit
ImportError: No module named repository
$ uname -a
Linux caph 3.13.0-143-generic #192-Ubuntu SMP Tue Feb 27 10:45:36 UTC
2018 x86_64 GNU/Linux

-- 
Regards,
Peng