In order for you to play Metro: Last Light Redux on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
64-bit Ubuntu 12.04 or 14.04 or Steam OS
Processor (CPU):
Intel Core i5 2.7 GHz (or equivalent AMD)
Memory (RAM):
4 GB RAM
Graphics Card:
NVIDIA Geforce 460 / AMD 5850 with 2GB VRAM
Storage:
10 GB available space
In order to play Metro: Last Light Redux on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
64-bit Ubuntu 12.04 or 14.04 or Steam OS
Processor (CPU):
Intel Core i7 2.5 Ghz (or equivalent AMD)
Memory (RAM):
8 GB RAM
Graphics Card:
NVIDIA Geforce 680 / AMD 7870 with 2GB VRAM+
Storage:
10 GB available space