In order for you to play Dota Underlords on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 16.04 or newer
Processor (CPU):
Intel i5, 2.4 Ghz or better
Memory (RAM):
4 GB RAM
Graphics Card:
Vulkan-capable GPU from NVIDIA, AMD, or Intel
Network:
Broadband Internet connection
Storage:
5 GB available space
Sound Card:
OpenAL Compatible Sound Card