Why do I get a startup error "XIO: fatal IO error 1" in RoadRunner R2021b on Ubuntu 21.04?

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Since I start RoadRunner, I get the following error:
QVariant::load: unknown user type with name uiWindowLayout.
QVariant::load: unknown user type with name uiWindowLayout.
WARNING: Qt message: The X11 connection broke: No error (code 0)
XIO: fatal IO error 11 (Die Ressource ist zur Zeit nicht verfügbar) on X server ":1"
after 433 requests (433 known processed) with 0 events remaining.

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 17 Nov 2021
Ubuntu 21.04 is currently not supported. Use the supported operating system such as Ubuntu 18.04 or Windows 10 instead.

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R2021b

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