The first time I edited /etc/gdm3/greeter.dconf-defaults It did not work. Then I undone what I have done before: Deleted /etc/dconf/profile/gdm, /etc/dconf/db/gdm.d/00-login-screen, /etc/dconf/db/gdm.d/, /etc/dconf/db/gdm and then I've run "dconf update" again. All of that leaving the file /etc/gdm3/greeter.dconf-defaults as suggested. This time It worked fine.
Lastly I've made a clean OS reinstall using today's daily-live bionic iso and only edited /etc/gdm3/greeter.dconf-defaults as suggested. It worked fine.
I followed straightly all the steps (https:/ /help.gnome. org/admin/ system- admin-guide/ stable/ login-userlist- disable. html.en). A database similar to yours was created at /etc/dconf/db/gdm.
The first time I edited /etc/gdm3/ greeter. dconf-defaults It did not work. Then I undone what I have done before: Deleted /etc/dconf/ profile/ gdm, /etc/dconf/ db/gdm. d/00-login- screen, /etc/dconf/ db/gdm. d/, /etc/dconf/db/gdm and then I've run "dconf update" again. All of that leaving the file /etc/gdm3/ greeter. dconf-defaults as suggested. This time It worked fine. greeter. dconf-defaults as suggested. It worked fine.
Lastly I've made a clean OS reinstall using today's daily-live bionic iso and only edited /etc/gdm3/