From log:
Setting up postfix (2.9.1-5) ...
Installing new version of config file /etc/init.d/postfix ...
Installing new version of config file /etc/postfix/post-install ...
Installing new version of config file /etc/postfix/postfix-files ...
Installing new version of config file
Thank you for taking the time to report this bug and helping to make
Ubuntu better.
This looks like a local configuration problem, rather than a bug in
Ubuntu. As such, I'm marking this bug as Invalid.
You can find pointers to get help for this sort of problem here:
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https://bugs.launchpad.net/bugs/1011089
Title:
package postfix 2.9.1-5 failed to install/upgrade: ErrorMessage:
subprocess installed post-installation script
