In order for you to play Lethal League on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 14.04
Processor (CPU):
Core 2 Duo or equivalent - 2.0 GHz or higher
Memory (RAM):
2 GB RAM
Graphics Card:
NVidia Geforce FX, 6x00, 7x00, 8x00, 9x00 and GTX 2x0 and newer. ATI Radeon 9x00, Xx00, X1x00, HD2x00 and HD3x00 series and newer. Intel® HD Graphics
Storage:
1 GB available space