In order for you to play Total War: WARHAMMER on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 16.10 64-bit, SteamOS 2.0
Processor (CPU):
3.4GHz Intel Core i3-4130, 3.5GHz AMD FX6300
Memory (RAM):
4 GB RAM
Graphics Card:
1GB Nvidia 650ti or better (driver version 367.28), 2GB AMD R9 270 or better (Mesa 13.0.1 driver compiled using LLVM 3.9)
Storage:
29 GB available space
In order to play Total War: WARHAMMER on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 18.04 64-bit
Processor (CPU):
3.4 GHz Intel Core i7-4770
Memory (RAM):
8 GB RAM
Graphics Card:
4GB Nvidia 970 (driver version 396.24), 4GB AMD RX 480 (Mesa 18.1.5)
Storage:
35 GB available space