I was tying to change my login background in rhel6.
I go to. /use/share/backgrounds
There is image there ``default.png``
Now I've copied image that I want to set as background in that folder, renaming default.png to d.png . And rename myimage.jpg to default.png to be its default.
But it didn't happen. It stops loading gnome after loading its services and turn my screen into dark mode