While fighting with my discrete graphics card, I reinstalled Ubuntu several times. The first couple times I was very careful to move the .priv and .der key I was using to sign my dkms kernel modules to another partition. Unfortunately, as I got more frustrated I became less careful and apparently accidentally cut and pasted from the backup (rather than copying and pasting) and then reformatted over the sole remaining key in the next re-install. I used
photorec to try and recover the files but unfortunately no *.der or *.priv files were recovered.
It seems that the intended way to un-enroll machine owner keys (MOKs) is
mokutil --delete keyname.der
Given that I no longer have the public key, is there another way for me to un-enroll it?