Bug#1127652: grub-efi-amd64-signed: Booting grub is impossible on 2.14 version with "failed to install protocols" and "cannot load image" errors

[Huey Chen]

Package: grub-efi-amd64-unsigned
Version: 1+2.12+9
Severity: important
X-Debbugs-Cc: horsey_guy at proton.me

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Dear Maintainer,

I have upgraded to 2.14 on Experimental, but booting does not work at all. Errors such as:
```
error: ../../../grub-core/loader/efi/linux.c:437:failed to install protocols
```
and
```
error: ../../../grub-core/loader/efi/linux.c:227:cannot load image
```
occur, and these prevent any progression. I since then have downgraded to 2.12.9 on Trixie, which fixes the issue.

I wonder if this affects others who upgraded to 2.14.

One thing I need to mention is that I installed the 2.14 version to test out the argon2id addition and switched the key to argon2id with `cryptsetup luksConvertKey`. Before the downgrade, I switched back to the old pbkdf2.

- -- System Information:
Debian Release: forky/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 6.19-amd64 (SMP w/12 CPU threads; PREEMPT)
Kernel taint flags: TAINT_USER
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages grub-efi-amd64-signed depends on:
ii  grub-common  2.12-9

Versions of packages grub-efi-amd64-signed recommends:
ii  shim-signed  1.47+15.8-1

grub-efi-amd64-signed suggests no packages.

Versions of packages grub-efi-amd64-unsigned depends on:
ii  grub-common  2.12-9

- -- no debconf information

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