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Changing the gdm3 (login screen) background in Gnome3

Gnome

I upgraded to Gnome3 this week, and after half a day of debugging I got my (quite non-standard) setup working completely again. One of the things that got broken was my custom wallpaper on the gdm3 login screen. This used to be configured in /etc/gdm3/greeter.gconf.defaults, but apparently Gnome3 replaced gconf by this new "gsettings" thingy.

Anyway, to change the desktop background in gdm, add the following lines to /etc/gdm3/greeter.gsettings:

[org.gnome.desktop.background]
picture-uri='file:///etc/gdm3/thinkpad.jpg'

For reference, I also found some other method, which looks a lot more complicated. I suspect it also doesn't work in Debian, which runs gdm as root, not as a separate "gdm" user. Systems that do use such a user might need the more complicated method, I guess (which probably ends up storing the settings somewhere in the homedir of the gdm user...).

Copyright by Matthijs Kooijman