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How to disable user list in login screen

Customizing the Login Screen

The GNOME Login Screen has several elements that can be customized. These changes can only be performed by a system administrator and affect all users. This section describes how to customize the greeter text, logo, keyboard layout, and user list.

Disabling the Login Screen User List

You can disable the user list shown on the login screen by setting the org.gnome.login-screen.disable-user-list GSettings key.
When the user list is disabled, users need to type their user name and password at the prompt to log in.

 Setting the org.gnome.login-screen.disable-user-list Key

  1. Create or edit the gdm profile in /etc/dconf/profile/gdm which contains the following lines:
    user-db:user
system-db:gdm
file-db:/usr/share/gdm/greeter-dconf-defaults
    gdm is the name of a dconf database.
  2. Create a gdm database for machine-wide settings in /etc/dconf/db/gdm.d/00-login-screen:
    [org/gnome/login-screen]
# Do not show the user list
disable-user-list=true
  3. Update the system databases by updating the dconf utility:
    # dconf update