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
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https://bugs.launchpad.net/bugs/686343
Title:
package postfix 2.6.5-3 failed to install/upgrade:
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