Bug#1119959: grub-efi-amd64: downgrading from 2.14-rc to 2.12 fails

[Eric Valette]

Package: grub-efi-amd64
Version: 2.14~git20250718.0e36779-2
Severity: important


apt install grub-common=2.12-9 grub-efi=2.12-9 grub-efi-amd64=2.12-9 grub-efi-amd64-bin=2.12-9 grub-efi-amd64-unsigned=2.12-9 grub-efi-amd64-signed=1+2.12+9 grub2-common=2.12-9
The following packages were automatically installed and are no longer required:
  libgeos3.14.0  libgnome-desktop-3-20t64  libplasmaactivities6  python3-cwcwidth
Use 'apt autoremove' to remove them.

DOWNGRADING:
  grub-common  grub-efi  grub-efi-amd64  grub-efi-amd64-bin  grub-efi-amd64-signed  grub-efi-amd64-unsigned  grub2-common

Summary:
  Upgrading: 0, Installing: 0, Downgrading: 7, Removing: 0, Not Upgrading: 2
  Download size: 0 B / 7,369 kB
  Space needed: 2,952 kB / 68.0 GB available

Continue? [Y/n] 
Preconfiguring packages ...
dpkg: warning: downgrading grub-efi (2.14~git20250718.0e36779-2) to (2.12-9)
(Reading database ... 735135 files and directories currently installed.)
Preparing to unpack .../0-grub-efi_2.12-9_amd64.deb ...
Unpacking grub-efi (2.12-9) over (2.14~git20250718.0e36779-2) ...
dpkg: warning: downgrading grub-efi-amd64 (2.14~git20250718.0e36779-2) to (2.12-9)
Preparing to unpack .../1-grub-efi-amd64_2.12-9_amd64.deb ...
Unpacking grub-efi-amd64 (2.12-9) over (2.14~git20250718.0e36779-2) ...
dpkg: warning: downgrading grub-efi-amd64-unsigned (2.14~git20250718.0e36779-2) to (2.12-9)
Preparing to unpack .../2-grub-efi-amd64-unsigned_2.12-9_amd64.deb ...
Unpacking grub-efi-amd64-unsigned (2.12-9) over (2.14~git20250718.0e36779-2) ...
dpkg: warning: downgrading grub-efi-amd64-bin (2.14~git20250718.0e36779-2) to (2.12-9)
Preparing to unpack .../3-grub-efi-amd64-bin_2.12-9_amd64.deb ...
Unpacking grub-efi-amd64-bin (2.12-9) over (2.14~git20250718.0e36779-2) ...
dpkg: warning: downgrading grub-efi-amd64-signed (1+2.14~git20250718.0e36779+2) to (1+2.12+9)
Preparing to unpack .../4-grub-efi-amd64-signed_1+2.12+9_amd64.deb ...
Unpacking grub-efi-amd64-signed (1+2.12+9) over (1+2.14~git20250718.0e36779+2) ...
dpkg: warning: downgrading grub-common (2.14~git20250718.0e36779-2) to (2.12-9)
Preparing to unpack .../5-grub-common_2.12-9_amd64.deb ...
Unpacking grub-common (2.12-9) over (2.14~git20250718.0e36779-2) ...
Replaced by files in installed package grub2-common (2.14~git20250718.0e36779-2) ...
dpkg: warning: downgrading grub2-common (2.14~git20250718.0e36779-2) to (2.12-9)
Preparing to unpack .../6-grub2-common_2.12-9_amd64.deb ...
Unpacking grub2-common (2.12-9) over (2.14~git20250718.0e36779-2) ...
Setting up grub-common (2.12-9) ...
Could not execute systemctl:  at /usr/bin/deb-systemd-invoke line 148.
Setting up grub-efi-amd64-signed (1+2.12+9) ...
Setting up grub-efi-amd64-unsigned (2.12-9) ...
Setting up grub2-common (2.12-9) ...
Setting up grub-efi-amd64-bin (2.12-9) ...
Setting up grub-efi-amd64 (2.12-9) ...
Installing for x86_64-efi platform.
Installation finished. No error reported.
/usr/sbin/update-grub: 3: exec: grub-mkconfig: not found
dpkg: error processing package grub-efi-amd64 (--configure):
 installed grub-efi-amd64 package post-installation script subprocess returned error exit status 127
dpkg: dependency problems prevent configuration of grub-efi:


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

Kernel: Linux 6.12.56 (SMP w/16 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE
Locale: LANG=fr_FR.UTF8, LC_CTYPE=fr_FR.UTF8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages grub-efi-amd64 depends on:
ii  debconf [debconf-2.0]  1.5.91
ii  grub-efi-amd64-bin     2.14~git20250718.0e36779-2
ii  grub2-common           2.14~git20250718.0e36779-2
ii  ucf                    3.0052

grub-efi-amd64 recommends no packages.

grub-efi-amd64 suggests no packages.

-- debconf information:
* grub2/linux_cmdline_default: quiet
  grub2/force_efi_extra_removable: false
  grub2/kfreebsd_cmdline:
  grub2/enable_os_prober: true
  grub2/kfreebsd_cmdline_default: quiet
* grub2/linux_cmdline: rootfstype=ext4 libata.force=10.00:3G
  grub2/update_nvram: true