About changing lightdm unity greeter background image, most answers are to change /usr/share/glib2.0/schemas/com.canonical.unity-greeter.gschema.xml. Is there any way to change the default wallpaper in lightdm unity greeter without changing the file? Like an override file.

I'm making a debian package that would apply our own artwork after installing. I can't changing the file content in my maintainer script, which would violate debian packaging policy. I can change the unity desktop background by adding a schema override file in the same folder, but I couldn't find a way to change the lightdm background with similar way.

  • I added a override file with [com.canonical.unity-greeter] background=<my_background_path> Didn't work.
    – Franklin
    Apr 10, 2014 at 8:49

2 Answers 2


In Ubuntu 12.04, it is possible to do this programmatically via the dconf database for user lightdm e.g.

sudo -u lightdm dbus-launch --exit-with-session \
gsettings set com.canonical.unity-greeter background /usr/share/backgrounds/Tie_My_Boat_by_Ray_García.jpg

The change takes effect when lightdm is restarted.


add to package:

debian/install with content

debian/10_unity_greeter_background.gschema.override /usr/share/glib-2.0/schemas/

debian/10_unity_greeter_background.gschema.override with content


debian/postinst with content

glib-compile-schemas /usr/share/glib-2.0/schemas/

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