[Bug 790538] Re: pam update causes cron to stop working with "Module is unknown" error

[Chris Siebenmann]

This PAM issue also affects xdm, which no longer allows people to log in
(it syslogs the same error message). This has caused us serious problems
on our multiuser login servers, because of course we cannot simply
reboot the machines and restarting xdm has the pleasant side effect of
instantly logging off all xdm-based users.

It has probably broken other daemons as well, some of them depending
on details of their configuration.

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https://bugs.launchpad.net/bugs/790538

Title:
  pam update causes cron to stop working with "Module is unknown" error

Status in “pam” package in Ubuntu:
  Confirmed

Bug description:
  Upgrading libpam-modules from 1.1.1-4ubuntu1 to 1.1.1-4ubuntu2.2, cron stopped working, just gives a log message "Module is unknown". This happened during unattended-upgrades this night, so there might be a lot of people who didn't realize that yet.
  Downgrading to 1.1.1-4ubuntu1 fixes this.
  Ubuntu 10.10 amd64, almost vanilla, fresh, minimum install + java (ppa) + postgresql9 (ppa).