Installing Ubuntu 20.04.1 LTS on a DELL xps 8940 with NVIDIA(R) GeForce(R) RTX 2060
The problem was the BIOS settings were configured specifically for Windows.
Here's a link to snap shots with the new BIOS settings.
https://imgur.com/a/9uLrTM2
At one point the BIOS settings got corrupted while attempting to reconfigure them and the motherboard CMOS coin battery had to be removed for ten minutes to reset the BIOS configuration.
Please be aware that many of the security and other modern processor features have been disabled.