Thank you, Fábio! My guess is that you made some typo the first time, which speaks for the documented way being error prone. So with this information, I'm thinking of asking the GNOME help developers to consider to replace it with showing how to edit /etc/gdm3/greeter.dconf-defaults. The latter way is apparently easier and, probably, safer.
** Changed in: gnome-user-docs (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1759043 Title: gdm3 disable-user-list does not work bionic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-user-docs/+bug/1759043/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs