In the logs:
Setting up postfix (2.6.5-3) ...
Adding group `postfix' (GID 122) ...
Done.
usermod: user 'postfix' does not exist in /etc/passwd
dpkg: error processing postfix (--configure):
subprocess installed post-installation script returned error exit status 6
Strange, as there doesn't seem to
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/38389376/Dependencies.txt
** Attachment added: "Dmesg.txt"
http://launchpadlibrarian.net/38389377/Dmesg.txt
** Attachment added: "DpkgTerminalLog.gz"
http://launchpadlibrarian.net/38389378/DpkgTerminalLog.gz
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Coul