Unity-greeter does not follow the wallpaper set for my user. Under 12.04.
I have tried tracing this back, it seems like, that the wallpaper has to be under /usr/share/backgrounds in order to be "visible" for unity-greeter.
The odd thing is, that for a different user on the same machine the greeter works just fine, and follows the wallpaper even if it's in the home folder of that user.
I am completely stuck now, and the least thing I want to do is to create a new user and start everything over again.
Any help is appreciated!