In order for you to play Guns of Icarus Alliance on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 12.04 LTS (Linux machine configuration not supported)
Processor (CPU):
Dual-core 2.4GHz or better (Intel Core 2 Duo E6600 or equivalent)
Memory (RAM):
3 GB RAM
Graphics Card:
DirectX9c-compatible dedicated graphics card with at least 512MB VRAM (GeForce 240 GT or better)
Network:
Broadband Internet connection
Storage:
10 GB available space