I just upgraded my Ubuntu from 12.04 to 12.10 and I see when I right click on the desktop and click on change desktop background, all I get is the system settings dialogue and not the change desktop wallpaper dialogue.
How can I get it back?
UPDATE: (updated the title) I logged in using Gnome session and there when I click on change desktop background I am able to change the desktop background.
And when I do the same on Unity I am not able to do anything. It just takes me to the settings page.