hello.
i have in apparmor.d profiles for postfix's files, probably they are from apparmor-profiles package, may be from /usr/share/doc/apparmor-profiles/extra/ . and i have gone to install postfix. but it did not install without error messages. some apparmor logs appeared during install, i have fixed for them profiles and uninstall and reinstall postfix, then again fixed profiles and such one or several more times but after that even though there were not any log , it could not be installed without errors. only when i have set one and then also other profile to complain mode it has been installed without error messages. bug is that apparmor blocked up programs runned by post-install script and post install script returned error code but apparmor has not logged anything about that.
i had written this at http://ubuntuforums.org/showpost.php?p=8569634&postcount=93 .
I'm going to mark this as Fix Released since a lot of work has been done on the postfix profiles and they are known to work.