In order for you to play Metro Exodus on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 20
Processor (CPU):
Intel Core i5 - 4440
Memory (RAM):
8 GB RAM
Graphics Card:
GTX 670 | Radeon R9 380 - 4GB VRAM
In order to play Metro Exodus on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 20
Processor (CPU):
Intel Core i7-4770k
Memory (RAM):
8 GB RAM
Graphics Card:
GTX 1070 | RTX 2060 | AMD RX 5500 XT - 8 GB VRAM