sounds strange. You don't happen to (also) use an external source such as NIS och LDAP for your user information? Can you give me the output of these two commands?
$ getent group | egrep "postdrop|winbindd_priv" and $ ls -la /etc/postfix/ -- package postfix 2.5.5-1.1 failed to install/upgrade: https://bugs.launchpad.net/bugs/349743 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
