You are not logged in.
I think you need to run those commands as a regular user.
From what I can see about the slick greeter, it uses gschema to store its configuration settings that can be over-written via a conf file. By running the commands above you are telling it to not use user-backgrounds and to use one specific background. If running it as your user doesn't work, try un-commenting those lines in the conf file.
You can always check whats happening by reviewing the log file identified above.
Please remember to mark your thread [SOLVED] to make it easier for others to find
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Running those commands as myself didn't help. I edited /etc/lightdm/slick-greeter.conf as root, uncommented the line specifying the background, changed the background to the one I want (It's a picture of the Mars rover, probably taken from Perseverance before takeoff.) and logged out. This worked. Thanx for all of your help with this.
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