In order for you to play HITMAN on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 16.04 or Steam OS 2.0
Processor (CPU):
Intel Core i5-2500K/AMD FX-8350
Memory (RAM):
8 GB RAM
Graphics Card:
Nvidia GeForce GTX 680/AMD R9 270X graphics card or better*
Storage:
81 GB available space
In order to play HITMAN on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 17.04 or Steam OS 2.0
Processor (CPU):
Intel Core i7 3770
Memory (RAM):
16 GB RAM
Graphics Card:
Nvidia GeForce GTX 970/AMD R9 290 graphics card or better*
Storage:
81 GB available space