In order for you to play Knights and Merchants on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 12.04 or SteamOS
Processor (CPU):
Intel or AMD Singlecore CPU
Memory (RAM):
512 MB RAM
Graphics Card:
3D graphics card with OpenGL support
Network:
Broadband Internet connection
Storage:
500 MB available space
Sound Card:
required
In order to play Knights and Merchants on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 15.10 or SteamOS
Processor (CPU):
Intel or AMD Singlecore CPU
Memory (RAM):
1 GB RAM
Graphics Card:
3D graphics card with OpenGL support
Network:
Broadband Internet connection
Storage:
500 MB available space
Sound Card:
required