I was bitten by this too. In my case, it's because I installed postfix within a chroot that I was using schroot to enter, but postfix wasn't installed in the real root. Each time I'd enter the chroot, /etc/group would be copied from the real root into the chroot, losing the 'postdrop' group created by dpkg-reconfigure.
Solution: create the 'postdrop' group in the real root too, and ensure it has the same GID. -- 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
