If you want this in, then one must adjust secureboot-db package service
unit to ignore the error from sbkeysync, and/or declare the relevant
error codes as normal.

This behaviour has been discussed on the grub_distros keybase channel,
without any objections raised.

And no, seeing that package update / sbkeysync succeeded once, is not
good enough. As one has to verify that on every boot. Becuase dbx
variable store can be reverted/reset between each boot back to stock
defaults. Thus a single success from sbkeysync, can only give a false
sense of security.

** Changed in: sbsigntool (Ubuntu Groovy)
       Status: Fix Released => Triaged

** Changed in: sbsigntool (Ubuntu Focal)
       Status: In Progress => Won't Fix

** Changed in: sbsigntool (Ubuntu Bionic)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1892797

Title:
  sbkeysync fails to return non-zero on error

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