1) Download appropriate .run file from Nvidia's website
    https://www.nvidia.com/Download/index.aspx?lang=en-us

2) install gcc, make, and linux headers

sudo apt install linux-headers-$(uname -r) gcc make pkg-config libglvnd-dev

3) Sign out to the login screen and press Ctr Alt F3

4) Kill the desktop manager
    sudo telinit 3

5) Run the installer
    bash sh

6) Enroll the kernel module
    sudo mokutil --import /usr/share/nvidia/nvidia-modsign-crt-xxxxx.der
    
7) Reboot and enroll the kernel module with secure boot

https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html#pre-installation-actions
https://docs.nvidia.com/datacenter/tesla/tesla-installation-notes/index.html
https://ubuntu.com/blog/how-to-sign-things-for-secure-boot
https://linuxconfig.org/how-to-install-the-nvidia-drivers-on-ubuntu-20-04-focal-fossa-linux