You could check out Hyperspace D6. It is a rules light reimagining of the old West End Games Star Wars D6 system. You wouldn’t have to use the Star Wars setting for it.
https://drive.google.com/drive/mobile/folders/1LjVQZVHLKtEaJO_XGe8VDRy6IWVk1sKt?usp=sharing
Nothing, and so they do. Dell will sell you an XPS 13 with Ubuntu installed. Lenovo will let you select Ubuntu or fedora in some models. System76 and Tuxedo will sell you a bunch of laptops only with Linux. Starlabs sells Linux laptops. KDE sells a laptop. Purism sells Linux laptops.
Did you just assume no one sells a Linux laptop?