I would like to briefly follow up to let people know that regressions are 
treated very seriously in Ubuntu. Regressions are closely examined to identify 
areas of improvement going forward, and as such, we have created a public 
incident report in:
https://wiki.ubuntu.com/IncidentReports/2011-05-31-pam-security-update-breaks-cron

Full details can be seen in that report, but here is a quick summary of what 
happened after the regression was found:
 * mirroring was stopped
 * the regressed packages were removed from the Ubuntu archive
 * the cause of the regression was identified and updates prepared
 * the fixed packages were built and verified to correct the issue and then 
were published to the archive
 * once it was established that mirroring could be safely re-enabled, it was
 * an email was sent to ubuntu-security-announce 
(https://lists.ubuntu.com/archives/ubuntu-security-announce/2011-May/001341.html)
 * the Ubuntu website was updated (http://www.ubuntu.com/usn/usn-1140-2/)

We are still conducting a post-mortem of the incident and identifying
areas of improvement so this does not happen again. One improvement that
has already been made is we have adjusted our pam test scripts to catch
this problem in the future.

We apologize for the inconvenience.

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

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

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