SOLVING DISPLAY BRIGHTNESS PROBLEMS | LINUX MINT
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1. Click on the Menu button, select Terminal. (0: 20s)
2. In the terminal, type the command: sudo add-apt-repository ppa: indicator-brightness / ppa, Enter your password and then Enter key when indicated. (0:39s)
3. Execute the command: sudo apt-get update and wait then execute: sudo apt-get install indicator-brightness. (1:23s)