minimal:
reqprocessor: AMD Athlon II X4 640 @ 3.0 Ghz / or Intel Core 2 Quad 9400 @ 2.66 Ghz
reqgraphics: AMD HD 5770 / or Nvidia GTX 460, with 1024MB VRAM. Latest available proprietary drivers from both manufacturers.
reqmemory: 2 GB RAM
reqdiskspace: 4 GB available space
reqsystem: Ubuntu 14.04 x86
reqother: Controller support: 3-button mouse, keyboard and speakers. Special multiplayer requirements: Internet Connection or LAN for multiplayer.

recommended:
reqprocessor: AMD Phenom II X4 850 @ 3.3 Ghz or Intel i3 2100 @ 3.1 Ghz
reqgraphics: AMD HD 6850 or Nvidia GTX 560TI with 1024MB VRAM
reqmemory: 4 GB RAM
reqdiskspace: 4 GB available space
reqsystem: Ubuntu 14.04 x64