I suffer from this bug, too. In my case, it was probably caused by an editing error on /etc/group. Fixed by running sudo groupadd postdrop
Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910962 Title: installArchives() failed: dpkg: unrecoverable fatal error, aborting: syntax error: unknown group 'postdrop' in statoverride file Error in function: SystemError: E:Sub-process /usr/bin/dpkg returned an error code (2) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/910962/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs