will it be solved when my probleem with the gnome-system-tools is solved ?
No
can I find this functonality elswhere ?
Not as such:
The arctica-greeter responsible for the loginscreen on 22.04 is not compatible with the login changer.
Solutions:
-
You can revert to slick-greeter to get the functionality back
(done that on my system, a very good solution) -
You can use the workarounds mentioned in the thread below:
(One is a bash based GUI to change background, the other one is just changing the backgroundpicture in the corresponding directory.)