Oh nevermind. I see the problem. You are in a Wayland session where the
'xgamma' and 'xrandr' commands are not expected to work. If you want to
use them you will probably need to log into 'Ubuntu on Xorg'. I don't
know of any equivalent commands for Wayland sessions, and they would
need to be specific to each display server anyway.
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1928294
Title:
gamma adjustment not working
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