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What I would try next is disabling validation. (...) The command is simple: sudo mokutil --disable-validation. Then the same MOK drill you used previously. (...)


OK, I'll try this suggestion as soon as I can. The only problem is that I don't really remember what were the commands I used when enrolling my keys to use with VirtualBox :? I copied them from an article somewhere, maybe I can find it again.

Do you think I can do this without further enrolling other MOK keys? I realized just ...

Are you unable to access the secure boot settings and associated keys from within the EFI?


I never even thought to use the EFI shell in such a way before. I guess this is a great time to delve deeper into that topic, given the potential reward :D


You cannot even disable secure boot? Regaining control of your EFI admin access should be your first priority.


Nope, this machine was sold to me with a locked BIOS, and I can't contact the seller to claim the password. I found this SO answer ...

Hello,

I have a machine with Secure Boot enabled which I cannot disable. I cannot even enter this machine's BIOS menu [1].

This has severely impacted my choices of OSes that I can run in it, with Ubuntu being my choice for the longest of times. Recently, however, I realized Debian 12 also supported Secure Boot, and so I immediately made my move to install it, as it is my favorite OS.

The netinstall ISO booted flawlessly on this machine, and the installation went perfectly (as perfect as any ...