When setting up a new Debian Gnome it’s nice to make things look the way you want. Here’s a few changes I make to sort out my desktop.
Hide a User from the gdm3 Login Screen
This is how to hide a single user from the login screen – not hide all users. This is different to how it was done in earlier versions.
Create/edit a file with the users login name in
$ sudo vi /var/lib/AccountsService/users/myuser
Add the following or just change the
SystemAccount value to
[User] Language= XSession= SystemAccount=true
Put the gdm3 Login Screen on Your Preferred Monitor
When Debian gets installed sometimes my monitors appear the wrong way around and my primary display is monitor 2. In user mode I can change this easy enough, but the gdm login remains the wrong way around.
The process is straight forward. Move things around as your user and then copy your user config to the gdm user. This is
Debian-gdm for Buster but may just be
gdm on other flavours.
$ sudo cp ~/.config/monitors.xml ~Debian-gdm/.config/
and for Ubuntu
$ sudo cp ~/.config/monitors.xml ~gdm/.config/