Is it one of those ASUS or similar ones? There is a wifi dongle that has drivers for linux, and says on the box linux support, but actually both the kernel and the provided drivers for the chipset are broken, you need to clone the github of the CHIP manufacturer, and compile it. After that, it works.
So as it turns out the original FlatOut is a very different game from it’s sequel, and is a pretty unique and complete game of its own.