We have been notified of some game-crashing issues on Ubuntu relating to sound library compatibility. Specifically, the engine seems to very strongly prefer pulseaudio.

We are working with our engine support team and investigating personally but the fix may take some time.

In the meantime, Risk System on Ubuntu seems like it is likely to have issues for some distros/configurations. To some extent, this is unavoidable (the Linux ecosystem is large and complicated) but we will do our best to at least describe the settings we see working and update our system requirements to make purchase decisions more informed.