Sorry, you are right. ATM this may be just a single person's problem ;)
I transferred it here:
https://answers.launchpad.net/ubuntu/+question/697140
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https://bugs.launchpad.net/bugs/19289
Public bug reported:
I'm running a surface 6 pro with a customized kernel which is MOK signed
for secure boot.
The system ran a customized MOK signed 5.8.16 kernel when I upgraded from 20.10
to 21.04.
The upgrade worked smooth without errors.
The system also started well on reboot booting the u
