I scoured the web when I got my MSI GS65 Stealth with GeForce GTX 1660 Ti/PCIe/SSE2 and installed Ubuntu 18.04. I tried pretty much everything but nothing helped.
What did it for me was installning Ubuntu 19.10. Everything worked right out of the box and seeing as Ubuntu 20.04 LTS is right around the corner, this feels like a viable solution.