I have the same error caused by installing mutt, though I have a slightly different terminal output.
sudo apt-get install postfix Reading package lists... Done Building dependency tree Reading state information... Done postfix is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 0B of additional disk space will be used. Setting up postfix (2.6.5-3) ... id: cannot find name for group ID 32321 usermod: user 'postfix' does not exist in /etc/passwd dpkg: error processing postfix (--configure): subprocess installed post-installation script returned error exit status 6 Processing triggers for libc-bin ... ldconfig deferred processing now taking place Errors were encountered while processing: postfix E: Sub-process /usr/bin/dpkg returned an error code (1) -- Could not install postfix - postinst failed to properly create postfix user https://bugs.launchpad.net/bugs/512646 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
