Comment 2 for bug 686343

Thanks for reporting this bug, and helping to make Ubuntu better.

Based on the VarLogDistupgradeApttermlog.gz content, it looks like
your /etc/postfix/main.cf contains lines which belong in your
/etc/postfix/master.cf. If you don't yet have any local customizations,,
then the easiest fix might be to

apt-get purge postfix
apt-get install postfix

to clear out the erroneous configs and create new ones. Please let
us know if this is not an option, or if this doesn't work.