In order for you to play Ultimate ADOM - Caverns of Chaos on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 16.04 & Ubuntu 18.04 & Ubuntu 20.04
Processor (CPU):
x64 architecture with SSE2 instruction set support.
Memory (RAM):
1 GB RAM
Graphics Card:
OpenGL 3.2+, Vulkan capable.
Storage:
1500 MB available space