Install cortina by entering the following commands in the terminal:
sudo apt update sudo apt install cortina
Description:
Desktop wallpaper management application for GNOME
Cortina is a simple, lightweight, and fast-working wallpaper changer for the GNOME desktop. It can cycle through wallpapers at a specified interval, and works as a tray application with a configuration interface.
Homepage: https://launchpad.net/cortina
Version: 1.1.1-1ubuntu1
Section: universe/gnome