For my Geforce 970m , ubuntu 18.04 ue4.26
been running great for a day now, before it was crashing after the project would load.
Hope this helps .
sudo apt install vulkan-sdk-runtime
sudo apt install vulkan-tools
sudo apt-get install mesa-vulkan-drivers mesa-vulkan-drivers:i386
Changed my /UnrealEngine/Engine/Config/BaseEngine.ini , to this
bSupportsVulkan=true
bSupportsVulkanSM5=true
bDetectVulkanByDefault=true