Privileged access to your Linux system as root or via the sudo command.
# - requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command
$ - requires given linux commands to be executed as a regular non-privileged user
Ubuntu 20.04 wallpaper slideshow step by step instructions
Use the Software application to install shotwell image viewer. Alternatively execute the following command to install Shotwell:
$ sudo apt install shotwell
Start shotwell image viewer application using the Activities menu.
Using your mouse select all desired images to be part of the desktop wallpaper slideshow
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While all the the images are selected click on File and select Set as Desktop Slideshow.
Set the time between each automatic wallpaper change. Optionally, also set wallpaper slideshow to be shown on your lock screen.
Wait until the image exporting is completed and you should be all set