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According to the log file: Running newaliases newaliases: warning: valid_hostname: numeric hostname: 1 newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 1 It seems that the hostname of the system is invalid. I'd suggest to fix the hostname to be a valid hostname. ** Changed in: postfix (Ubuntu) Importance: Undecided => Low ** Changed in: postfix (Ubuntu) Status: New => Invalid -- package postfix 2.7.0-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 75 https://bugs.launchpad.net/bugs/663101 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs