I am very much interested in changing the login screen of my 18.04 LTS (not the lock screen, the login screen) which is noise-texture.png. I followed this link How do I change login screen purple color to another one or image (if possible) on Ubuntu 17.10? But doing like what this discussion said, I get a grayish lock screen which freezes on login. Although I am able to log in but there is no wallpaper on the login screen. Please help.
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