[Mailman-Users] alias not updating

[Dan Brita]

I have a new installation of Mailman 2.1.12 running on Ubuntu with Postfix. 
When I create a list, it does not update my /etc/aliases file. It does update 
the /var/lib/mailman/data/aliases file. This causes Postfix to reject any email 
sent to the list. What have I done wrong in configuring this server?
Any help is appreciated.
------------------------------------------------------
Mailman-Users mailing list Mailman-Users@python.org
http://mail.python.org/mailman/listinfo/mailman-users
Mailman FAQ: http://wiki.list.org/x/AgA3
Security Policy: http://wiki.list.org/x/QIA9
Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/
Unsubscribe: 
http://mail.python.org/mailman/options/mailman-users/archive%40jab.org