Ubuntu 20.04 GUI failed with RTX3070 Laptop (Asus TUF Gaming A15) and NIVIDIA 460.39 driver

Here’s the complete procedure to get your notebook running:
https://forums.developer.nvidia.com/t/ubuntu-mate-20-04-with-rtx-3070-on-ryzen-5900-black-screen-after-boot/167681/30?u=generix