Traceback (most recent call last):
  File "/usr/sbin/flumotion", line 60, in <module>
    _run_main(PROGRAM_PATH)
  File "/usr/sbin/flumotion", line 43, in _run_main
    from flumotion.twisted import reflect
  File "/usr/lib/flumotion/python/flumotion/twisted/reflect.py", line 27, in <module>
    from twisted.cred import checkers, credentials
ImportError: No module named twisted.cred