How to Force Quit an Application on Ubuntu 18.04 LTS?
Step 1: Right click on the Desktop, and then click on 'open Terminal.'
Step 2: Type 'xkill' command without quotes, and then Hit enter key on the keyboard.
Step 3: Now, go to your application that you want to force quit, and then left click on it. It will be closed.
Step 4: After that, you can close the terminal.
It's done
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