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
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passwd says "Module is unknown"
https://bugs.launchpad.net/bugs/487019
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