In order for you to play Dungeons 3 on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 16.04.3 LTS + SteamOS (latest)
Processor (CPU):
Intel Quad Core 2.8 GHz (i7 900 series) or 3.5 GHz AMD (FX 6000 series)
Memory (RAM):
4 GB RAM
Graphics Card:
AMD/NVIDIA dedicated graphic card, with at least 1024MB of dedicated VRAM and with at least DirectX 11 and Shader Model 5.0 support (AMD Radeon HD 7000 series and NVIDIA GeForce GTX 600 series)
Storage:
5 GB available space
In order to play Dungeons 3 on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 16.04.3 LTS + SteamOS (latest)
Processor (CPU):
Quad core 3.5 GHz or higher (Intel i5 4000 Series / AMD Ryzen 3 Series)
Memory (RAM):
8 GB RAM
Graphics Card:
AMD/NVIDIA dedicated graphic card, with at least 3072MB of dedicated VRAM and with at least DirectX 11 and Shader Model 5.0 support (AMD R9 300 Series and NVIDIA GeForce GTX 900 Series or better)
Storage:
5 GB available space