Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 474, in _inline_callbacks
    result = gen.send(result)
  File "/usr/share/software-center/softwarecenter/backend/aptd.py", line 142, in fix_broken_depends
    self.emit("transaction-started", "", "", "")
TypeError: 4 parameters needed for signal transaction-started; 3 given