How to Kill an Unresponsive Application on Ubuntu 18.04 LTS?
Step 1: Click on 'Show Applications' at the bottom left.
Step 2: Do a Search for 'System Monitor,' and then click on it to open it.
Step 3: Click on the 'search' button, search for your unresponsive application.
Step 4: Select it by clicking on it, right click on that. After that, click on 'kill process' button
It's done
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