To install DesktopNova in Ubuntu, enter the the following commands in the Terminal:
sudo apt-get install desktopnova desktopnova-module-gnome sudo add-apt-repository ppa:michael-astrapi/ppa sudo apt-get update sudo apt-get install indicator-desktopnova
After that, launch DesktopNova to set your desired settings. the above mentioned commands include installation for the system tray indicator as well.
You can access settings from Preferences vi the system tray option.
To add wallpaper images for rotation, go to the Images tab and file(s) or folder(s).
You can set desired wallpaper rotation time frame from the Settings tab.
Note: Make sure you click on Start Daemon from Settings to ensure that the Daemon is running.
For the Daemon to work, you will require selecting at least one module, click on Modules from Settings and select a module before you start the daemon (which will enable wallpaper rotation).
Once the daemon starts, wallpaper rotation will start.