Installing Nvidia Graphics Drivers on Debian 12 "Bookworm" and enrolling machine owner's key (MOK) to use DKMS modules

*Editor's Note: I'm adding the link below as I answered his original question. If the OP disagrees with this please remove the edit* Linked Question: What do I need to make my Debian see my external monitor? I am trying to install Nvidia Graphics Drivers on Debian 12 "Bookworm". I am following this guide, and when I try to perform the part that says "enroll your machine owner's key (MOK) to use DKMS modules" (because I have secure boot enabled), I get this failure:

# mokutil --import /var/lib/dkms/mok.pub
Failed to get file status, /var/lib/dkms/mok.pub

Also, the containing directory is missing:

# ls /var/lib/dkms/
ls: cannot access '/var/lib/dkms/': No such file or directory

Any ideas on what I should do?