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[Launchpad Bug Tracker <1928434@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package shim - 15.4-0ubuntu7

---------------
shim (15.4-0ubuntu7) hirsute; urgency=medium

  * Fix load option parsing, and thus fwupd execution (LP: #1929471) (PR #379)
  * Fix occasional crashes in _relocate() on arm64 (LP: #1928010) (PR #383)
  * Fix accidental deletion of RT variables (LP: #1934506) (PR #387)
  * mok: relax the maximum variable size check (LP: #1934780) (PR #369)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Wed, 07 Jul 2021 10:57:35
+0200

** Changed in: shim (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Changed in: shim-signed (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1928434

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

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-signed source package in Xenial:
  Fix Released
Status in shim-signed source package in Bionic:
  Fix Committed
Status in shim source package in Focal:
  Fix Released
Status in shim-signed source package in Focal:
  Fix Released
Status in shim source package in Hirsute:
  Fix Released
Status in shim-signed source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  Booting MacBook is broken

  [Test plan]
  We don't have a test plan per se to verify this bug, but the shim fix has been tested. Hard to verify those bugs :(

  [Where problems could occur]
  We disable mirroring of vendor dbx into MokListXRT EFI variable, so mokutil is not able to read the vendor dbx anymore. Other things might not be able to do so either; we don't believe we've been using it so far, though.

  [Original bug report]
  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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