I'm having trouble figuring out how to configure gdm3. I want to exclude certain usernames from the login screen. /usr/share/gdm/gdm.schemas has a "greeter/Exclude" section, but is that really where I should add my usernames to? I was expecting something in /etc. Maybe it goes in /etc/gdm3/daemon.conf, but I'm not sure of the syntax. Any help would be appreciated. -Rob