[Bug 1928434] Re: shim-signed does not boot on EFI 2.40 by Apple

[Steve Langasek]

Kris, we would appreciate if you could run the above test as requested
by Julian and let us know if it boots on your system.  We take boot
regressions seriously and have put upgrades to 21.04 on hold for all
users while this bug remains unresolved, but it's important to be able
to close this bug out so that we can turn those upgrades back on.  Once
we have confirmation of a fixed shim, this will also need to publish
this to all stable releases, because Microsoft has already issued
revocations of our older shims.  Thanks!

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Title:
  shim-signed does not boot on EFI 2.40 by Apple

Status in shim package in Ubuntu:
  Triaged
Status in shim-signed package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  I have a MacBookPro14,3. After upgrade to Ubuntu 21.04 it failed to boot.
  At first I thought I'm affected by https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1925010.

  But my MacBook has newer efi Version and the fixed version of shim-
  signed is not solving my issues.

  >sudo dmesg | grep EFI
  [    0.000000] efi: EFI v2.40 by Apple
  [    0.011978] ACPI: UEFI 0x000000007AF7D000 000042 (v01 INTEL  EDK2     00000002      01000013)
  [    0.012029] ACPI: Reserving UEFI table memory at [mem 0x7af7d000-0x7af7d041]
  [    0.411423] fb0: EFI VGA frame buffer device
  [    0.418914] EFI Variables Facility v0.08 2004-May-17
  [    2.696996] fb0: switching to amdgpudrmfb from EFI VGA

  I reinstalled Ubuntu 21.04 from scratch and updated all packages during installation.
  The reboot failed. I hear the apple start sound and then an endless repeating echo.
  I've chrooted inside my system and verified that shim-signed 1.47+15.4-0ubuntu2 is installed.

  The suggested workaround from the other bug works (I can normally boot afterwards):
  /boot/efi/EFI# cp -b ubuntu/grubx64.efi ubuntu/shimx64.efi
  /boot/efi/EFI# cp -b ubuntu/grubx64.efi BOOT/BOOTX64.EFI

  "sudo apt reinstall shim-signed" reliable breaks my macbook again.

  Is there anything I can do to help solving this issue? What do you
  need?

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