Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/backend/channel_impl/aptchannels.py", line 157, in _check_for_channel_updates_timer
    if self._check_for_channel_updates():
  File "/usr/share/software-center/softwarecenter/backend/channel_impl/aptchannels.py", line 173, in _check_for_channel_updates
    cache_origins = set(self.db._aptcache.get_all_origins())
  File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 298, in get_all_origins
    for pkg in self._cache:
  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 189, in __iter__
    yield self[pkgname]
  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 174, in __getitem__
    pkg = self._weakref[key] = Package(self, self._cache[key])
KeyError: 'flashplugin-downloader:i386'