Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 472, in _inline_callbacks
    result = gen.throw(result.type, result.value, result.traceback)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/gtk3widgets.py", line 644, in _run
    yield self._transaction.run()
TransactionFailed: Transaction failed: None
 Package [dbus.String(u'libyelp0')] is already installed