Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 166, in _process_transaction
    lock.wait_for_lock(trans)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/lock.py", line 163, in wait_for_lock
    logging.error("Failed to lock the cache")
NameError: global name 'logging' is not defined