This bug was fixed in the package unity-greeter - 0.2.9-0ubuntu1

---------------
unity-greeter (0.2.9-0ubuntu1) precise-proposed; urgency=low

  * New upstream release:
    - Backport better keyboard focus handling from upstream as new windows
      appear and disappear. This fixes keyboard navigation in dialogs
    - Don't write garbage data to state cache file
    - Make sure background alpha is never stuck at non-1.0 value, blocking
      login
    - When the default session is changed in lightdm.conf, don't still show the
      Ubuntu badge
    - Recognize the "kde-plasma" session as "kde" so it gets a properly branded
      icon in the greeter
    - Try to run unity_support_test for ubuntu for pre-caching the result in
      /tmp for further call while the user is typing his password
    - Support multiple prompts from PAM (LP: #972537)
    - Support timed login (LP: #902852)
  * debian/control:
    - Bump build-depends on liblightdm-gobject-1-dev
  * debian/patches/fix-focus.patch:
  * debian/patches/fix-hung-logging-in.patch:
  * debian/patches/recognize-kde-plasma.patch:
  * debian/patches/run_unity_support_test.patch:
  * debian/patches/show-changed-default-badge.patch:
  * debian/patches/state-file-garbage.patch:
    - Applied upstream
 -- Robert Ancell <robert.anc...@canonical.com>   Wed, 21 Nov 2012 15:41:57 
+1300

** Changed in: unity-greeter (Ubuntu Precise)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/972537

Title:
  lightdm doesn't allow expired passwords

Status in “lightdm” package in Ubuntu:
  Fix Released
Status in “unity-greeter” package in Ubuntu:
  Fix Released
Status in “lightdm” source package in Precise:
  Triaged
Status in “unity-greeter” source package in Precise:
  Triaged

Bug description:
  [Impact]
  Kerberos accounts on Ubuntu 12.04.1 can't force password changes via 
unity-greeter.

  [Test Case]
  1. Set up a Kerberos server and client machine (see 
http://bobthegnome.blogspot.co.nz/2012/11/testing-kerberos-in-ubuntu.html)
  2. Log into unity-greeter on client machine
  Expected result:
  Unity Greeter shows appropriate prompts to change password and can log in 
once password changed/
  Observed result:
  Some prompts skipped, password not changed and unable to log in.

  [Regression Potential]
  Potential of breaking other authentication. This has been tested with the 
lightdm regression tests.

  In Ubuntu 12.04, when logging in using the unity greeter in lightdm
  (1.1.9-0ubuntu1) with a user using Kerberos with an expired password,
  the login screen doesn't give the user the appropriate feedback to set
  their new password.  The text console works correctly.  The previous
  LTS used GDM, which behaved correctly.

  The normal prompting for this is:
  Username: cmo-test
  Password:  ****
  Password expired.  You must change it now.
  Enter new password:  ****
  Enter it again:  ****

  Instead, in lightdm, it is:
  Username: cmo-test
  Password: ****
  Enter it again: ****

  The "Password expired" message is never shown, and "Enter it again" is
  shown in the box instead of "Enter new password".  If you use lighdm-
  gtk-greeter, you get the "password expired" message printed under the
  box, but still have the same prompting, never asking for the new
  password.

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