Comment 1 for bug 880104

I am using Oneiric (11.10). I am setting up desktop computers to use MIT Kerberos for authentication, and OpenLDAP to provide the system with user account information. Like the original poster, I have been experiencing group membership problems when logging in via LightDM, but not from the console. I tested the same against a local machine user account. In /etc/group.conf, I set up group membership for the local account's local group to another local group (I used irc -- GID 39). The pam_group module works properly when logging into a console (irc shows up as a group when executing groups and id), but it does not work when logging in via LightDM.

Just to make sure I had covered all of my bases, I installed GDM and tried to duplicate the problem with group membership. The problem did not exist in GDM like it does in LightDM. I even tried KDM, XDM, and WDM, with each working properly. It would appear that LightDM needs to be updated to work properly with pam_group. For now, I will use GDM.