It just displays the default Ubuntu background instead of the one I set. I didn't have the issue with 17.10 before upgrading.
Does anyone have an idea how to fix that?
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I had the same problem, and ultimately found the answer here:- Unity greeter background not changing for users automatically after upgrade This was actually an old post for 12.04 and I used dconf-editor to make the changes,rather than gsettings set, but the gist of it is:- com.canonical.unity-greeter draw-user-backgrounds should be set to true (which it was on my setup) gnome.settings-daemon.plugins.background active should be set to true (it was set to false on my setup) Please note that I had to do this for all of the users on the PC. Does anyone know if it is possible to set this for all users as a default? Anyway, hope this helps :-) Mick