Install xflip by entering the following commands in the terminal:
sudo apt update sudo apt install xflip
Description:
programs to mirror-image or melt your display
Flip your (or your "xhost +" using friend's) screen on either the vertical or horizontal axis or melt away the graphics on your display. Both commands, named xflip and meltdown, have a -planes option to independently act on individual bit planes. This version now comes with a new -oblic option which flips horizontally and vertically simultaneously.
Version: 1.01-27
Section: universe/games