minimal:
reqprocessor: Intel Core 2 Quad Q9400 @ 2.66 GHz / AMD Athlon II X4 650 @ 3.20 GHz
reqgraphics: ATI Radeon HD 5850 or NVIDIA GeForce GTX470 with 1GB VRAM / Latest available proprietary drivers from both manufacturers
reqmemory: 4 GB RAM
reqdiskspace: 2 GB available space
reqsystem: Ubuntu 14.04 LTS x32
reqother: Controller support: 3-button mouse, keyboard, and speakers are required. / Internet Connection or LAN for multiplayer, Up to 32 other players in multiplayer mode.

recommended:
reqprocessor: Intel Core i5 750 @ 2.66 GHz / AMD Phenom II X4 955 @ 3.20 GHz
reqgraphics: ATI Radeon HD 6950 or NVIDIA GeForce GTX570 with 2GB VRAM / Latest available proprietary drivers from both manufacturers
reqmemory: 4 GB RAM
reqdiskspace: 2 GB available space
reqsystem: Ubuntu 14.04 LTS x64
reqother: Controller support: 3-button mouse, keyboard, and speakers are required. / Internet Connection or LAN for multiplayer, Up to 32 other players in multiplayer mode.