Bug#1021301: grub-pc: regression: update to 2.06-3~deb11u2 fails with gpt

[Ansgar]

Package: grub-pc
Version: 2.06-3~deb11u2
Severity: important
X-Debbugs-Cc: debian-release at lists.debian.org

Hi,

the upgrade to grub-pc 2.06-3~deb11u2 fails:

+---
| Setting up grub-pc (2.06-3~deb11u2) ...
| Installing for i386-pc platform.
| grub-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
| grub-install: error: embedding is not possible, but this is required for cross-disk install.
| You must correct your GRUB install devices before proceeding:
|
|   DEBIAN_FRONTEND=dialog dpkg --configure grub-pc
|   dpkg --configure -a
| dpkg: error processing package grub-pc (--configure):
|  installed grub-pc package post-installation script subprocess returned error exit status 1
| Errors were encountered while processing:
|  grub-pc
| Log ended: 2022-09-23  06:09:42
+---

The previous version installed successfully and the system was booting
without problems so far:

+---
| Setting up grub-pc (2.06-3~deb11u1) ...
| Installing for i386-pc platform.
| Installation finished. No error reported.
| Generating grub configuration file ...
| Found linux image: /boot/vmlinuz-5.10.0-17-amd64
| Found initrd image: /boot/initrd.img-5.10.0-17-amd64
| Found linux image: /boot/vmlinuz-5.10.0-16-amd64
| Found initrd image: /boot/initrd.img-5.10.0-16-amd64
| Warning: os-prober will be executed to detect other bootable partitions.
| Its output will be used to detect bootable binaries on them and create new boot entries.
| done
| Log ended: 2022-09-12  06:51:32
+---

/dev/sda uses GPT and has one partition /dev/sda1; it was created this
way by d-i (though it has the setting to use gpt enabled).

Ansgar