This bug was fixed in the package lightdm - 1.1.9-0ubuntu1

---------------
lightdm (1.1.9-0ubuntu1) precise; urgency=low

  [ Gunnar Hjalmarsson ]
  * debian/guest-account: Add trailing '/' to the line
    "gs_skel=/etc/guest-session/skel" (LP: #956152).

  [ Robert Ancell ]
  * New upstream release:
    * Add --show-users/--hide-users to lightdm-set-defaults
    * Call initgroups before pam_setcred - this allows pam_setcred to change
      group membership correctly (LP: #880104)
 -- Robert Ancell <[email protected]>   Thu, 22 Mar 2012 16:48:59 
+1100

** Changed in: lightdm (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/880104

Title:
  Using pam_group results in: pam_group(lightdm:setcred): unable to set
  the group membership for user: operation not permitted

Status in Light Display Manager:
  Fix Released
Status in “lightdm” package in Ubuntu:
  Fix Released

Bug description:
  I have configured many computers to authenticate through a openldap server. 
To be able to be admin in each computer, I use pam_group feature to select 
additional groups for user. (/etc/security/group.conf).
  Login directly on the console give me good group membership (the one defined 
in group.conf), but login from lightdm results in an error message in 
auth.local: 
  pam_group(lightdm:setcred): unable to set the group membership for user: 
operation not permitted.

  Of course, the group membership is not set as it should.

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