BTW: as Joris Le Blansch wrote, using dconf-editor GUI to set /org/gnome/login-screen/disable-user-list to ON has no effect and after reboot userlist is shown as before.
So, at this point:
1. Manually changing the file '/etc/gdm3/greeter.dconf-defaults' uncommenting the lines:
#[org/gnome/login-screen]
and
# disable-user-list=true
Work in Ubuntu 18.04 Beta 2 but doesn't work in Ubuntu 17.10.
2. Using dconf-editor GUI to set '/org/gnome/login-screen/disable-user-list' to ON just doesn't work...
BTW: as Joris Le Blansch wrote, using dconf-editor GUI to set /org/gnome/ login-screen/ disable- user-list to ON has no effect and after reboot userlist is shown as before.
So, at this point:
1. Manually changing the file '/etc/gdm3/ greeter. dconf-defaults' uncommenting the lines: org/gnome/ login-screen] user-list= true
#[
and
# disable-
Work in Ubuntu 18.04 Beta 2 but doesn't work in Ubuntu 17.10.
2. Using dconf-editor GUI to set '/org/gnome/ login-screen/ disable- user-list' to ON just doesn't work...