Traceback (most recent call last):
  File "/lib/udev/udev-add-printer", line 23, in <module>
    import cupshelpers
  File "/usr/lib/python2.7/dist-packages/cupshelpers/__init__.py", line 47, in <module>
    from cupshelpers import				\
  File "/usr/lib/python2.7/dist-packages/cupshelpers/cupshelpers.py", line 24, in <module>
    import packagekit.client, packagekit.enums
ImportError: No module named packagekit.client