Situatie
Solutie
Changing Ubuntu’s lock screen background is done the same way as on any other operating system, like Windows. Simply right-click on your desktop and click the “Change Background” option.
Next, head over to the “Background” section, which shows you a gallery of images. Then, click on any image you would like to apply as the lock screen background.
After that, close the tab and lock your screen. Your desktop and lock screen background will change to your chosen image.