Easiest GPU passthrough guide for Ubuntu

The main improvement in this guide over the previous guide is the support for two identical GPUs.
This guide works for both Ubuntu 20.04 and 20.10. As of early November 2020, Ubuntu 20.10 has some bugs in VM manager. I don’t recommend using 20.10 until those get fixed. For now, use 20.04 instead.

Download Passthrough helper here: https://github.com/pavolelsig/passthrough_helper_ubuntu_20

Arch Linux Wiki Error 43:
https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF

Sources:
vfio-pci-override-vga.sh is a slightly modified version of the script found here:
http://vfio.blogspot.com/2015/05/

source
ubuntu