I installed Kubuntu desktop and I'm having a few problems with it. Firstly, the wallpaper I set get doesn't stay and it just reverts back to the default wallpaper. Second, I set a background for the login screen but it just shows a blank white background behind the login box. Is there a way to fix this. I noticed it happens with any distro that has KDE as the default desktop i.e. Fedora, openSUSE.