In order for you to play Caves of Qud on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 20.04, Ubuntu 18.04, and CentOS 7
Processor (CPU):
1GHz or faster. SSE2 instruction set support.
Memory (RAM):
4 GB RAM
Graphics Card:
Graphics card: OpenGL 3.2+, Vulkan capable
Storage:
2 GB available space