Comment 0 for bug 1928434

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 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?