Traceback (most recent call last):
  File "/usr/bin/install-package", line 208, in commit
    result = self._cache.commit(self.fprogress,self.iprogress)
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 311, in commit
    res = self._fetchArchives(fetcher, pm)
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 234, in _fetchArchives
    raise LockFailedException("Failed to lock %s" % lockfile)
LockFailedException: Failed to lock /var/cache/apt/archives/lock