Bug#1035332: grub-efi-arm64: "error: failed to install/update FDT." after bullseye upgrade

[Vagrant Cascadian]

On 2023-04-30, Vagrant Cascadian wrote:
> After updating to the latest point release, these apm mustang systems
> fail to boot the kernel, all I see is:
>
>     error: failed to install/update FDT.
>     Loading Linux 5.10.0-22-arm64 ...
>     Loading initial ramdisk ...
>
>     Press any key to continue...

The workaround was to uninstall shim-signed and re-install grub
(grub-install /dev/sda ; grub-install /dev/sdb).

Worked for three of three machines so far... I tested re-installing
shim-signed on one machine and re-installing grub and the problem came
back.

No idea why this started happening just now, as shim-signed and related
packages were all installed before the bullseye point release, but did
not have this problem...

live well,
  vagrant
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