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It would appear that you installation is not configured with a valid hostname (see error message in comment #2). You will need to resolve this issue before postfix will startup correctly. You can do this by editing /etc/hostname to contain a valid hostname OR you can set the myhostname configuration parameter in /etc/postfix/main/cf. Please update this bug report if this resolves your issue. Thanks ** 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/766833 Title: package postfix 2.7.0-1ubuntu0.1 failed to install/upgrade: el subproceso instalado el script post-installation devolvió el código de salida de error 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