I somehow rotated the Ubuntu 17.10 screen so it ended up upside down (I think I accidentally triggered a keyboard shortcut). I could not get it to rotate back by clicking the screen rotate button in the task menu, so I had to reboot.
Is there a keyboard shortcut for rotating the screen 180 degrees? The rotation happened on an HP Envy laptop with a touchscreen.
xrandr --query
to obtain the device, then usexrandr --output <device> --rotate normal
to fix my screen. This problem is infuriating! – jmcarter9t Oct 19 '18 at 14:50