Public bug reported:


I have a MacBookPro14,3. After upgrade to Ubuntu 21.04 it failed to boot.
At first I thought I'm affected by

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 
The reboot failed. I hear the apple start sound and then an endless repeating 
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 
/boot/efi/EFI# cp -b ubuntu/grubx64.efi ubuntu/shimx64.efi
/boot/efi/EFI# cp -b ubunt/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?

** Affects: shim (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: shim-signed (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: shim-signed (Ubuntu)
   Importance: Undecided
       Status: New

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  shim-signed does not boot on EFI 2.40 by Apple

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