It exists and if loaded in terminal it shows:
ai...@haikara:~$ sudo python /etc/mailman/mm_cfg.py
[sudo] password for airon:
Traceback (most recent call last):
File "/etc/mailman/mm_cfg.py", line 45, in <module>
from Defaults import *
ImportError: No module named Defaults
--
list_lists crashed with ImportError in <module>()
https://bugs.launchpad.net/bugs/590421
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