In order for you to play Insurgency on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 12.04
Processor (CPU):
Dual core from Intel® or AMD at 2.8 GHz
Memory (RAM):
4 GB RAM
Graphics Card:
NVIDIA GeForce 8600/9600GT, ATI/AMD Radeon HD2600/3600 (Graphic Drivers: nVidia 310, AMD 12.11), OpenGL 2.1
Hard Drive:
10 GB available space
Sound Card:
OpenAL Compatible Sound Card
In order to play Insurgency on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Memory (RAM):
8 GB RAM
Graphics Card:
Video card 2048 MB or more
Hard Drive:
10 GB HD space on a SSD