In order for you to play Counter-Strike: Global Offensive on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 20.04
Processor (CPU):
4 hardware CPU threads - Intel® Core™ i5 750 or higher
Memory (RAM):
8 GB RAM
Graphics Card:
AMD GCN+ or NVIDIA Kepler+ with up-to-date Vulkan drivers. Support for VK_EXT_graphics_pipeline_library highly recommended.
Storage:
85 GB available space
Sound Card:
Highly recommended