Ubuntu 21.04 has no GUI for the screen brightness. Add this repo:
# sudo add-apt-repository ppa:apandada1/brightness-controller
# sudo apt install brightness-controller
Now you can run the program, or add it to favorites.
Linux, Gadgets and Multimedia. In ye olde days a Cyprianus was the Wizard's spellbook. As a rule a Cyprianus manuscript started with these words: "Even though Roboam knew all the secrets of our Art he did not abuse his knowledge. Do Thou likewise."
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