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lonix
Asked: 2018-05-17 23:00:07 +0800 CST

Ask for username and password on 18's login screen [duplicate]

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I'm using the latest Ubuntu 18.04 LTS bionic.

When I login it shows my username and I just need to type a password.

I don't want usernames to be shown. I want to be forced to type a username and password.

How do I do that? All I found is info for old versions or lightdm (18 uses gdm).

gdm login login-screen

1 Answers

  1. Settings for gdm3 are done in /usr/share/gdm/greeter.dconf-defaults.

    Uncomment these 2 lines: 

    [org/gnome/login-screen]
disable-user-list=true

    (Only un-commenting the 2nd line will crash your login: bugreport confirming it works for 18.04) and restart the login manager with 

    sudo dpkg-reconfigure gdm3

    and reboot (or restart with sudo systemctl stop gdm and log out).

    Make a backup 1st so in case something get messed up and you can not log in you can use tty3 to redo your changes. edit: this wont work; gdm also takes care of the tty sessions so tty3 is dead too... you will need to user a live session or grub rescue prompt.

    Another way that works for 17.10 and 18.04 (from comment #7 by fprietog in the bug report):

    Using root:

    • Create a file named /etc/dconf/profile/gdm with this contents:

       user-db:user   
 system-db:gdm

    • Create a file named /etc/dconf/db/gdm.d/50-disable-user-list with this content:

      [org/gnome/login-screen]   
disable-user-list=true

    • Execute the command sudo dconf update

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