Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 178, in _process_transaction
    lock.wait_for_lock(trans)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/lock.py", line 180, in wait_for_lock
    raise TransactionCancelled()
TypeError: __init__() takes exactly 2 arguments (1 given)