Yet another variation on the long search for a way to hide my system’s user list from casual crackers who might get access to the device.
All previous posts on the topic of disabling or re-enabling Gnome 3’s login screen’s user list are obsolete as of Fedora 22.
Those instructions are mildly incomplete, at least for Fedora 22. Here is the complete recipe:
1. Create /etc/dconf/profile/gdm with the following contents:
user-db:user system-db:gdm file-db:/usr/share/gdm/greeter-dconf-defaults
2. Create /etc/dconf/db/gdm.d/00-login-screen with these contents:
3. This is important: Delete /etc/dconf/db/gdm.
4. As root run “dconf update”.
5. Restart gdm with “systemctl restart gdm”.
To reverse the effect edit 00-login-screen and replace “true” with “false” and then repeat steps 3, 4 and 5.
If you take these steps and the changes have no effect, try rebooting.
Should that not do it, su to root and delete /var/lib/gdm/.config/dconf/user.