I tried "sudo mokutil --set-verbosity true"
but >"This system doesn't support Secure Boot".

** Description changed:

  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 
+ >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 
  [    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
+ /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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  shim-signed does not boot on EFI 2.40 by Apple

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