Hi,
If I install various wallpapers from the Ubuntu repos (e.g. the ones from Ubuntu, Ubuntu Gnome, UbuntuStudio…), they don’t show up in the Appearance settings. Looking at how they are installed, it looks like Mate is only displaying the ones in /usr/share/backgrounds/mate rather than the standard /usr/share/backgrounds. Is this the normal/expected behaviour?
Using Ubuntu Mate 15.10.