Thanks for taking the time to submit this bug.
In the DpkgTerminalLog, I see:
Starting Postfix Mail Transport Agent postfix [80G postfix: warning:
valid_hostname: invalid character 40(decimal): (none)
postfix: fatal: unable to use my own hostname
What do you see when you do each of the following?
cat /etc/mailname
cat /etc/hostname
hostname
hostname --fqdn
** Changed in: postfix (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/808653
Title:
package postfix 2.8.2-1ubuntu2.1 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 1
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