Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/defer.py", line 533, in _inline_callbacks
    result = gen.throw(result.type, result.value, result.traceback)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/gtkwidgets.py", line 635, in _run
    yield self._transaction.run(defer=True)
TransactionFailed: org.debian.apt.TransactionFailed: error-package-already-installed:  Package gstreamer0.10-ffmpeg is already installed