Install edubuntu-wallpapers by entering the following commands in the terminal:
sudo apt update sudo apt install edubuntu-wallpapers
Description:
wallpapers included in edubuntu
A collection of wallpapers sourced from various contributors and art sites across the Internet. These are the wallpapers shipped with Edubuntu by default.
Homepage: http://www.edubuntu.org
Version: 15.12.1
Section: universe/gnome