Hi there, Thank you for taking the time to report bugs and trying to make Ubuntu Server better.
According to the information you have provided, it seems that the reason why it failed to upgrade is because one of the parameters can not contain the ' '(space) character in it: newaliases: warning: valid_hostname: invalid character 32(decimal): Front Desk So, this means that you would have to change the parameter accordingly to not to have any space characters in it. Once you change it, you should be able to do the following to complete the installation: sudo dpkg --configure -a Please, let us know how it goes. Cheers, ** Changed in: postfix (Ubuntu) Status: New => Confirmed -- 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/774541 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