Thanks for the bug report.
Those gamma commands only support Xorg, but you are using a Wayland
session without any Xorg running. To use a Xorg session you need to log
out and then select 'Ubuntu on Xorg' on the login screen.
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1970523
Title:
[Mesa Intel® HD Graphics 3000 (SNB GT2)] Cannot able to Change gamma
on Inspiron 3520.
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