Hi there, I'm sorry to hear the issues you're experiencing with the Linux version of the game. While it sounds like the first issue was resolved, I'm sorry to hear about the driver issue. I'm not sure if there's much that I can do for this as it's a limitation of Godot itself.
Beyond that, I also don't have personal experience with Linux. I can't offer much support other than exporting from a provided Linux template by the engine.