Comment 16 for bug 1500673

I am following this bug as I had some similar oddities after upgrading from U.Gnome 15.04 to 15.10. During the install I elected to keep the existing copy of /etc/gdm/custom.conf because I had made changes to the "list users" section that I wanted to keep.

Today I decided to replace my existing copy with the dpkg-dist copy, and low and behold, using that conf got everything back to normal. Just commenting in case it helps others.