Running Dota 2 on Ubuntu Linux with the Vulkan API
First off, to use Vulkan on Linux you need an Intel or NVIDIA GPU. I’m not sure about AMD — it probably works too.
On NVIDIA, you need the latest 370-series driver before Vulkan support can be enabled.
If you don’t have the latest driver installed, use the official PPA:
sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
sudo apt-get install nvidia-370