Install desktopnova-module-gnome by entering the following commands in the terminal:
sudo apt update sudo apt install desktopnova-module-gnome
Description:
GNOME module for DesktopNova
DesktopNova changes the desktop background image after an adjustable time. It can choose the images from single files and folders (with or without subfolders). An autostart feature is also implemented. . This package enables GNOME support for DesktopNova.
Homepage: http://launchpad.net/desktopnova
Version: 0.8.1-1ubuntu1
Section: universe/misc