In order for you to play Gravel on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 16.04 or later, SteamOS 2.0
Processor (CPU):
Intel Core i5-2500K; AMD FX-6350 or equivalent
Memory (RAM):
4 GB RAM
Graphics Card:
Intel Core i5-2500K; AMD FX-6350 or equivalent
Storage:
15 GB available space