[Bug 1925010] Re: shim-signed 15.4 does not boot on EFI 1.10 systems

[Steve Langasek]

Donald,

I'm very sorry that you're having this experience.  It is definitely
unrelated to the particular bug this report is about, which, if you were
experiencing, would prevent you from ever seeing a GRUB menu.

Have you tried booting the older 5.8.0-59-generic kernel that is still
installed on your system? (Not in recovery mode)  Perhaps the problem is
specific to the new kernel that was installed on your system with 21.04,
and booting the older 20.10 kernel will allow you to boot successfully
and continue debugging.

Otherwise, I think you will need to avail yourself of one of the support
options listed on <https://ubuntu.com/support/community-support>, as
this bug report is not the appropriate place to continue debugging your
issue.

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https://bugs.launchpad.net/bugs/1925010

Title:
  shim-signed 15.4 does not boot on EFI 1.10 systems

Status in shim package in Ubuntu:
  Fix Released
Status in shim-signed package in Ubuntu:
  Fix Released
Status in shim source package in Xenial:
  Fix Released
Status in shim source package in Hirsute:
  Fix Released
Status in shim-signed source package in Hirsute:
  Fix Released

Bug description:
  The latest update on Hirsute made the MacBook Air from 2012
  unbootable.

  It could be recovered by booting a 20.04 live CD, downloading 20.04's
  shim package and overwriting the files in EFI/ubuntu and EFI/BOOT with
  the files shipped in the shim package.

  Machines Affected (not comprehensive):
  MacBookPro8,2
  MacBookAir5,2

  [Test case]
  For a system that has applied the workaround from https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1925010/comments/14 and is bootable:

  - install shim-signed from hirsute-proposed
  - reboot
  - verify that the system now boots without workaround

  This test case applies only to hirsute.  For all other series, there
  has been no regression, and because this is the same binary across all
  series, no other SRU testing is required.

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