If you want to adjust your Laptop monitor brightness via a simple GUI, I suggest that you try Brightness Controller. Brightness Controller also allows to change the brightness on a secondary display.

The tool is also useful for users having brightness issues on their laptops. To install Brightness Controller under Ubuntu 16.04/Linux Mint 18, open the terminal and issue these commands:

sudo add-apt-repository ppa:apandada1/brightness-controller 
sudo apt update 
sudo apt install brightness-controller

Open Dash and start the app:


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