How to change lockscreen and login wallpaper with Arctica greeter?

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Hi @guyr,
similar issue has already been reported on Github: arctica-greeter does not honor gsettings changes · Issue #17 · ArcticaProject/arctica-greeter · GitHub.
The solution is already mentioned in current thread: How to change lockscreen and login wallpaper with Arctica greeter? - #3 by bornagainpenguin.
Arctica greeter settings are stored in /usr/share/glib-2.0/schemas/30_ubuntu-mate.gschema.override file. Inspect it, and you'll find arctica greeter section and different settings, including path to the background file. You may edit this file directly OR create your own override file. I recommend the latter approach.

  1. Create file /usr/share/glib-2.0/schemas/40_arctica-greeter.gschema.override .
  2. Contents: arctica greeter section header and desired background filename. Use original file as an example.
    [org.ArcticaProject.arctica-greeter]
    background='<your background here>'
  3. Run sudo glib-compile-schemas /usr/share/glib-2.0/schemas/ to recompile schemas.
  4. Relogin.

Hope this helps

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