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I came across this question, and it seems that OP is having issues with Redshift due to Xubuntu using Wayland. I was under the impression that XFCE plans to support Wayland in the upcoming version 4.18, and it does not support Wayland yet.

So, does Xubuntu 21.04 use Wayland by default?

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It is documented that Xubuntu (Xfce4) will be receiving Wayland in the future, but it is not there in Xubuntu 21.04 by default. I setup a quick VM and installed Xubuntu 21.04 just to verify. It defaults to x11 and Wayland is not a login option.

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Hope this helps!

Terrance
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Yes, it does

...as I found out after upgrading from 20.10. There were some glitches in Gnome extensions, and at one moment I noticed an error message like "this function doesn't work in Wayland".

So I rebooted and checked the login page. Indeed, the cog wheel gave me an option with Xorg and one with Wayland.

Jos
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