I'm getting this too. I think that this is that same problem as http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=384016.
** Changed in: mailman (Ubuntu) Status: Unconfirmed => Confirmed -- arch fails https://launchpad.net/bugs/74412 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs