In order for you to play Shovel Knight Showdown on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 12.04 and Newer
Processor (CPU):
Intel Core 2 Duo 2.0 ghz or equivalent
Memory (RAM):
2 GB RAM
Graphics Card:
2nd Generation Intel Core HD Graphics (2000/3000), 512MB
Storage:
250 MB available space