[Bug 1990326] Re: ubuntu server 20.04.5 cannot be installed after enable secure boot

[Steve Langasek]

Verifying the fix requires testing against a focal daily image built
with -proposed enabled, which we don't do by default.  I've now built
some daily images with -proposed enabled, which you can find here:

   https://cdimage.ubuntu.com/ubuntu-server/focal/daily-live/20221101/

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Title:
  ubuntu server 20.04.5 cannot be installed after enable secure boot

Status in debian-installer package in Ubuntu:
  Invalid
Status in shim package in Ubuntu:
  Invalid
Status in debian-installer source package in Focal:
  Fix Committed
Status in shim source package in Focal:
  Invalid

Bug description:
  Reproduce steps
  1. Enable secure boot in the UEFI.
  2. Fresh install ubuntu server 20.04.5 lts and latest daily build, but it fail with "An unauthorized EFI image is detected, please enroll this EFI image or disable secure boot ...."

  Others:
  1. Both ubuntu server 18.04.6 and 22.04 can be normal installed.

  It seem the key of 20.04.x has been added into the latest UEFI
  Revocation List File(Release Date: August 12,
  2022.https://uefi.org/revocationlistfile/archive).

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