...

Step 7h - REBOOT to allow all the changes to apply

Important: Depending on the hardware, your system may feature a primary onboard/offboard display selection. Generally, onboard is the display-port built into the motherboard, and offboard is a GPU-accelerated device. A bit more description here: Onboard/Offboard display notes by Operating System

• If your system DOES NOT have a built-in display port to the motherboard, meaning NO onboard/offboard selection, the display will naturally default to the only option- the Graphics Card
• If your system supports onboard/offboard display, results may vary whether the Ubuntu 20.04 login screen will loop or freeze

In the linked article, it shows no confirmed expectation for Ubuntu 20.04, this is because it really does differ depending on the hardware installed, and there are many many combinations of hardware that may or may not allow normal Ubuntu 20.04 behavior AFTER the login screen. If it hangs on the login screen, reboot the system, get to the screen again, and try 'ctrl+alt+f3' to reach a terminal-only screen again so you can resolve it when properly installing the NVIDIA drivers in step 8.

reboot

Step 8 - Installing NVIDIA driver

Once you get access to a terminal, whether getting lucky with the display as the system is locally, or SSH'ed via IP, you can install

#get root access again
sudo bash
<password>

#this downloads the NVIDIA driver .run file to whatever directory you are currently in
#for example sake, this is the latest A6000 Linux Driver file at the time of publishing this article
wget https://us.download.nvidia.com/XFree86/Linux-x86_64/460.56/NVIDIA-Linux-x86_64-460.56.run

#makes the .run file executable
chmod +x /NVIDIA-Linux-x86_64-460.56.run

#disables all GUI/display
init 3

#executes the now executable .run file
./NVIDIA-Linux-x86_64-460.56.run

If all steps above were performed correctly, it will NOT complain about nouveau being loaded, and you can just ignore ALL other questions and continue pressing <enter> until the NVIDIA driver installs. If it fails to install, it will clearly say that the NVIDIA Driver installation has failed. If this occurs, try running the installation file again, and provide us the LAST screen before the NVIDIA driver installation fails so we can further investigate.

If it successfully installs, you can run this command to check installed NVIDIA hardware.

#installed NVIDIA hardware
nvidia-smi

#installed NVLinks, if you have it (it can run this command even if you DON'T have them installed)
nvidia-smi nvlink -s

Step 9 - Install Teamviewer