How to install Superpaper multi monitor wallpaper manager on Ubuntu
Superpaper is a free and open source multi monitor wallpaper manager for Linux, Windows and Mac OS X. It supports Gnome, Budgie, Cinnamon, KDE, Mate, LXDE, LXQt, Pantheon, Mate, XFCE and i3, BSPWM with feh linux desktop environments. Using Superpaper you can set single image across all displays and also different image on every display. It also comes in Command-line interface. Some other important features are Hotkey support, set and control slideshow, bezel correction and pixel per inch correction. It is released in MIT License.