I have tryed installing balenaEtcher many times on many linux distros and it never seems to work. Right now I am using kubuntu, I installed it fine but when I launch it, it spits out this error.
Welcome to the Balena Forum! Sorry to see the experience. Looking at the error message; I’d say its some of the required window modules missing with KDE. Can you try installing kde-gtk-config and see if helps improve the situation?
Also, it would be great if you share details on the system OS you are running this on and previously tried at.