Ubuntu software center is not allowing me to download anything

[[e-mail]]

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 768, in simulate
    return self._simulate_helper(trans, status_path)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 938, in _simulate_helper
    return depends, status, self._cache.required_download, \
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 218, in required_download
    pm.get_archives(fetcher, self._list, self._records)
SystemError: E:I wasn't able to locate file for the python-gudev package. This might mean you need to manually fix this package.

[[e-mail] (ryansfeller)]

this just recently happened after i was downloading a media file converter and it stopped in the middle of installing and froze up on me. Since then i have not been able to download any software. Im also new to linux. Thanks. Ryan

[Sebastian Heinlein (glatzor)]

This error even reappears after a restart of the computer?

Have you enabled daily checks for updates? (update-manager -> preferences)