I have Ubuntu 12.04 installed. As a newbie, I followed instructions to load the Cinnamon and Gnome desktops for comparison purposes. After comparing, I decided I prefer the default Ubuntu desktop. My problem is, when I want to change my wallpaper now, I ALWAYS get the Cinnamon dialog box, not Ubuntu's. I have verified that I am choosing Ubuntu @ login, but I no Ubuntu options. Should I just un-install Cinnamon & Gnome?
As per this comment:
one should uninstall