I faced this, but not on a Mac. I have an ordinary Desktop PC with a Gigabyte 
880GM-USB3 (rev3.1) motherboard. This old motherboard does not have secure boot 
or MokManager or UEFI etc. It has a legacy BIOS. I installed Ubuntu 20.10 
(Groovy Gorilla) yesterday. Each time I start the PC, I'm shown the following 
message for around 10 seconds and only then it proceeds to grub: 
Failed to set MokListRT: Invalid Parameter
Could not create MokListRT: Invalid Parameter
Importing MOK states has failed: import_mok_state() failed: Invalid Parameter
Continuing boot since secure mode is disabled System BootOrder not found. 
Initializing defaults.
Creating boot entry "Boot0002" with label "ubuntu" for file 
"\EFI\ubuntu\shimx64.efi"
Failed to set MokListRT: Invalid Parameter
Could not create MokListRT: Invalid Parameter
Import MOK states has failed: import_mok_state() failed: Invalid Parameter
Continuing boot since secure mode is disabled.

I've attached an image of the error screen. The annoying thing about
this bug is that each time I start my PC, this message is shown for 10
seconds. Please fix this. Many people still use old computers that don't
have MokManager etc. Please take that into account.

** Attachment added: "Failed to set MokListRT: Invalid Parameter"
   
https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1867092/+attachment/5494299/+files/startupError

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Title:
  Failed to set MokListRT: Invalid Parameter

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