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You must replace libsteamapi.so with goldberg emu for flatpak. https://gitlab.com/Mr_Goldberg/goldberg_emulator

Hello. I wrote a nocsd solution based on libX11. If you are a Wayland user, you need to set the environmental variable 'GDK_BACKEND=x11'. It will force you to use XWayland...

I rewrite application. This version is deprecated. I will create new pull request