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Even PewDiePie thinks you should install Linux on your computer after saying he was "tortured by Windows"
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
Do you get a window? If so, you can xkill (or the Wayland equivalent, if you compositor provides one).
Failing that, yeah, it can be quite difficult to identify the right proc to kill. Sometimes showing the process "tree" and the full "command line" can help.
Beat of luck!
I run games in full screen mode, so maybe it would work. Seems like Wayland has
Ctrl+Meta+Esc
as the equivalent ofxkill
. I'll try this if it happens again.