In order for you to play Doorways: Prelude on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 12.04
Processor (CPU):
Intel Core i5-2310 CPU @ 2.90GHz
Memory (RAM):
1 GB RAM
Graphics Card:
NVIDIA GeForce GT 440
Storage:
2 GB available space
Sound Card:
100% DirectX 9.0c compatible Audio Device