Xrandr: Solve Screen Resolution Issues via command line in Ubuntu / Debian

[ Thanks to DIPIN for this link. ]

“Xrandr (X Rezise and Rotare) is a command line utility
available in your Linux system for reseting and resizing your
screen resolution. So, if there is any issues with your display, no
problem you can fix it from a Terminal.

“First You have to find the possible resolutions with xrandr

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