CreBS is an easy install in Ubuntu.
Once CreBS is installed, head over to your menu and launch CreBS.
To create your wallpaper slideshow just use the add button and select images to add to the wallpaper.
you could also drag and drop your wallpapers to change their order.
you could add as many and sections as you’d like.
The sections point to the actual wallpaper files and how long to show each image.
Unfortunately, you’re free to’t set the images to be displayed randomly.
keep your xml file in /usr/share/backgrounds/ to make it available for all users on the system.
Enjoy this handy trick to customize your install.