Just installed a 12.04 test VM and I still get the error message in 
/var/log/auth.log:
Mar  8 23:50:00 lightdm-test lightdm: pam_group(lightdm:setcred): unable to set 
the group membership for user: Operation not permitted

I also get an error message about ldap server not available:
Mar  8 23:50:01 lightdm-test dbus[736]: nss_ldap: could not search LDAP server 
- Server is unavailable
however I managed to connect ssh on the vm  and I get all my additional 
groups...

I suspect a change in pam handling as "su - " does not get the group anymore... 
quite strange...
lightdm and su can't fetch my groups whereas ssh can...

I can post my pam files if needed.

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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

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