In order for you to play Black Mirror on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
SteamOS or Ubuntu (64bit)
Processor (CPU):
Intel Q9650 / AMD Phenom II X4 940
Memory (RAM):
8 GB RAM
Graphics Card:
GeForce GTX660 / Radeon 7870 - 2GB VRAM
Storage:
11 GB available space
In order to play Black Mirror on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
SteamOS or Ubuntu (64bit)
Processor (CPU):
Intel Core i7 3770 3,9 Ghz / AMD FX-8350 4 GHz
Memory (RAM):
8 GB RAM
Graphics Card:
GeForce GTX960 / Radeon R9 290 - 4GB VRAM
Storage:
11 GB available space