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According to the log file: newaliases: warning: valid_hostname: numeric hostname: 1 newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 1 dpkg: error processing postfix (--configure): subprocess installed post-installation script returned error exit status 75 Please fix your hostname to be a valid hostname. ** Changed in: postfix (Ubuntu) Status: New => Invalid ** Changed in: postfix (Ubuntu) Importance: Undecided => Low -- 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/649559 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to postfix in ubuntu. -- 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