My friend lent me her laptop and she followed some tutorial on how to switch the wallpaper in GDM2 but it didn't work and now it's stuck with some wallpaper I can't seem to get rid of, how do I reset GDMs config?
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Open a gnome-terminal (Alt + F2 → gnome-terminal) and type the following:
To only reset the background:
sudo -u gdm gconftool-2 --unset /desktop/gnome/background/picture_filename
To reset all of GDM's configuration:
sudo -u gdm gconftool-2 --recursive-unset /
The second one will take a bit, both commands will ask you for your password.

htorque
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This doesn't work anymore: gconftool-2: command not found. Also not available for install. – Jarno_C-137 Dec 15 '23 at 08:31