In order for you to play SteamWorld Dig on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 12.04
Processor (CPU):
2 GHz
Memory (RAM):
512 MB RAM
Graphics Card:
OpenGL 2.1-compatible, 384 MB video memory, framebuffer object support
Storage:
80 MB available space
Sound Card:
OpenAL-compatible