In order to play Two Point Hospital on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 18.04/Steam OS
Processor (CPU):
Intel Core i5 6600 or AMD Ryzen 1600x
Memory (RAM):
8 GB RAM
Graphics Card:
NVIDIA Geforce GTX 1060, 3 GB (Legacy: NVIDIA Geforce GTX 780, 4GB) or AMD RX 580, 4 GB (Legacy: AMD R9 290X, 4GB )
Storage:
6 GB available space