Hello and thank you for that report. Can you please try to obtain a crash log by following the procedure described here: https://wiki.ubuntu.com/DebuggingProgramCrash
Be sure that you install the proper dbgsym package for this crash. In this case it should be the package gdm-dbgsym. Best regards ** Changed in: feisty-session-splashes (Ubuntu) Assignee: (unassigned) => Tom Kravanja Status: Unconfirmed => Needs Info -- gdm crashes on pressing button 'Enable Desktop Effects' https://launchpad.net/bugs/89754 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs