You have a problem with your PAM installation (see all the "... is missing" in your bug report).
The "Module is unknown" message indicates that a PAM module was not found, which is consistent. dpkg thinks that libpam-modules is installed on your machine, but a lot of files are missing, this might indicate a bigger issue. Reinstalling libpam-modules might solve your problem. ** Changed in: shadow (Ubuntu) Status: New => Invalid -- passwd says "Module is unknown" https://bugs.launchpad.net/bugs/487019 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