Comment 5 for bug 395861

Issue #1: Upgrading from 2.20 to 2.26 leaves you with two configuration files. Pretty confusing I'd say - especially because you have to manually configure GDM since there is no graphical tool (yet?) to do it.

Issue #2: Fresh installations just install 'custom.conf', which isn't used (yet?) by GDM. Again, if you want to configure GDM you'd probably put the information into that file rather than creating a new file called 'gdm.conf-custom' (which IS used by GDM).