Since I upgraded to Ubuntu 13.10 I can't find a way to chose a custom picture as desktop background.
System settings -> Background, but this menu does not provide any file picker or something to choose a picture but shows only the preinstalled pictures:
Or an empty window:
I cant find the options to set how the picture ought to be displayed neither (like stretch or scale)
Is it really true that this simple task isn't possible any more? Do I have to install Cinnamon desktop just to be able to change my background picture? Or how to do it with Ubuntu?