In order for you to play POSTAL Redux on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
SteamOS and Ubuntu 16.04+
Processor (CPU):
2.0 GHz dual core processor
Memory (RAM):
4 GB RAM
Graphics Card:
Graphics card w/ dedicated 512MB RAM
Storage:
4 GB available space
In order to play POSTAL Redux on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
SteamOS and Ubuntu 16.04+
Processor (CPU):
2.5 GHz multi core processor
Memory (RAM):
8 GB RAM
Graphics Card:
Graphics card w/ dedicated 1GB RAM
Storage:
4 GB available space