From log:
Setting up postfix (2.9.1-5) ...
Postfix configuration was not changed. If you need to make changes, edit
/etc/postfix/main.cf (and others) as needed. To view Postfix configuration
values, see postconf(1).
After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.
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.
Specifically, your system hostname is set incorrectly, thus making the
postfix postinst script
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Server Team, which is subscribed to postfix in Ubuntu.
https://bugs.launchpad.net/bugs/1014360
Title:
package postfix 2.9.1-5 failed to install/upgrade: subprocess
installed post-installation script returned error exit
** Tags removed: need-duplicate-check
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You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to postfix in Ubuntu.
https://bugs.launchpad.net/bugs/1014360
Title:
package postfix 2.9.1-5 failed to install/upgrade: subprocess
installed