Thanks for submitting this bug. The log shows
newaliases: warning: valid_hostname: numeric hostname: 04 newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 04 Is your hostname in fact '04', or did postfix manage to pick up the wrong name? What does running 'hostname' show? ** Changed in: postfix (Ubuntu) Status: New => Incomplete -- 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/778842 Title: package postfix 2.8.2-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 75 -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs