[Bug 2149961] Re: Dist-Upgrade failure / old linux-image-7.0.0-12-generic package postrm maintainer script subprocess failed with exit status 1

Wed Apr 22 18:47:58 UTC 2026

This looks like GrubCustomizer broke you grub config. This is not a bug in Ubuntu.
Converting to question.

** Package changed: ubuntu-release-upgrader (Ubuntu) => grub (Ubuntu)

** Changed in: grub (Ubuntu)
       Status: New => Invalid

** Converted to question:
   https://answers.launchpad.net/ubuntu/+source/grub/+question/824149

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https://bugs.launchpad.net/bugs/2149961

Title:
  Dist-Upgrade failure / old linux-image-7.0.0-12-generic package postrm
  maintainer script subprocess failed with exit status 1

Status in grub package in Ubuntu:
  Invalid

Bug description:
  Hi DevTeam,

  Keep getting this error for the last few days.

  Would be great if the error message would be a bit more verbose.

  And if dpkg -a would sort it ;)

  I used GrubCustomizer a few days ago - did not change much, except for
  graphic layout

  Original and Edited Grub Config - attached.

  Cheers

  ***

  sudo apt upgrade
  [sudo: authenticate] Password:          
  The following package was automatically installed and is no longer required:
    nvidia-firmware-580-580.142
  Use 'sudo apt autoremove' to remove it.

  REMOVING:
    linux-image-7.0.0-12-generic

  Summary:
    Upgrading: 0, Installing: 0, Removing: 1, Not Upgrading: 0
    3 not fully installed or removed.
    Freed space: 17.3 MB

  Continue? [Y/n] y
  (Reading database… 361247 files and directories currently installed.)
  Removing linux-image-7.0.0-12-generic (7.0.0-12.12)…
  /etc/kernel/postrm.d/initramfs-tools:
  update-initramfs: Deleting /boot/initrd.img-7.0.0-12-generic
  /etc/kernel/postrm.d/kdump-tools:
  kdump-tools: Removing kdump tracking files for kernel version: 7.0.0-12-generic
  /etc/kernel/postrm.d/zz-update-grub:
  Sourcing file `/etc/default/grub'
  Sourcing file `/etc/default/grub.d/kdump-tools.cfg'
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-7.0.0-14-generic
  Found initrd image: /boot/initrd.img-7.0.0-14-generic
  Found linux image: /boot/vmlinuz-7.0.0-13-generic
  Found initrd image: /boot/initrd.img-7.0.0-13-generic
  Found memtest86+ 64bit EFI image: /boot/mt86+x64
  Found memtest86+ 32bit EFI image: /boot/mt86+ia32
  Found memtest86+ 64bit image: /boot/mt86+x64
  Found memtest86+ 32bit image: /boot/mt86+ia32
  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.
  Found Windows Boot Manager on /dev/nvme1n1p1@/EFI/Microsoft/Boot/bootmgfw.efi
  Adding boot menu entry for UEFI Firmware Settings ...
  error: syntax error.
  error: Incorrect command.
  error: syntax error.
  Syntax error at line 338
  Syntax errors are detected in generated GRUB config file.
  Ensure that there are no errors in /etc/default/grub
  and /etc/grub.d/* files or please file a bug report with
  /boot/grub/grub.cfg.new file attached.
  run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 1
  dpkg: error processing package linux-image-7.0.0-12-generic (--remove):
   old linux-image-7.0.0-12-generic package postrm maintainer script subprocess fa
  iled with exit status 1
  dpkg: too many errors, stopping
  Errors were encountered while processing:
   linux-image-7.0.0-12-generic
  Processing was halted because there were too many errors.
  Error: Sub-process /usr/bin/dpkg returned an error code (1)

  ***

  sudo dpkg --configure -a
  Setting up linux-image-7.0.0-14-generic (7.0.0-14.14)…
  Setting up linux-image-7.0.0-13-generic (7.0.0-13.13)…
  Processing triggers for linux-image-7.0.0-14-generic (7.0.0-14.14)…
  /etc/kernel/postinst.d/initramfs-tools:
  update-initramfs: Generating /boot/initrd.img-7.0.0-14-generic
  /etc/kernel/postinst.d/kdump-tools:
  kdump-tools: Generating /var/lib/kdump/initrd.img-7.0.0-14-generic
  /etc/kernel/postinst.d/zz-update-grub:
  Sourcing file `/etc/default/grub'
  Sourcing file `/etc/default/grub.d/kdump-tools.cfg'
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-7.0.0-14-generic
  Found initrd image: /boot/initrd.img-7.0.0-14-generic
  Found linux image: /boot/vmlinuz-7.0.0-13-generic
  Found initrd image: /boot/initrd.img-7.0.0-13-generic
  Found memtest86+ 64bit EFI image: /boot/mt86+x64
  Found memtest86+ 32bit EFI image: /boot/mt86+ia32
  Found memtest86+ 64bit image: /boot/mt86+x64
  Found memtest86+ 32bit image: /boot/mt86+ia32
  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.
  Found Windows Boot Manager on /dev/nvme1n1p1@/EFI/Microsoft/Boot/bootmgfw.efi
  Adding boot menu entry for UEFI Firmware Settings ...
  error: syntax error.
  error: Incorrect command.
  error: syntax error.
  Syntax error at line 338
  Syntax errors are detected in generated GRUB config file.
  Ensure that there are no errors in /etc/default/grub
  and /etc/grub.d/* files or please file a bug report with
  /boot/grub/grub.cfg.new file attached.
  run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1
  dpkg: error processing package linux-image-7.0.0-14-generic (--configure):
   old linux-image-7.0.0-14-generic package postinst maintainer script subprocess failed with exit status 1
  Processing triggers for linux-image-7.0.0-13-generic (7.0.0-13.13)…
  /etc/kernel/postinst.d/initramfs-tools:
  update-initramfs: Generating /boot/initrd.img-7.0.0-13-generic
  /etc/kernel/postinst.d/kdump-tools:
  kdump-tools: Generating /var/lib/kdump/initrd.img-7.0.0-13-generic
  /etc/kernel/postinst.d/zz-update-grub:
  Sourcing file `/etc/default/grub'
  Sourcing file `/etc/default/grub.d/kdump-tools.cfg'
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-7.0.0-14-generic
  Found initrd image: /boot/initrd.img-7.0.0-14-generic
  Found linux image: /boot/vmlinuz-7.0.0-13-generic
  Found initrd image: /boot/initrd.img-7.0.0-13-generic
  Found memtest86+ 64bit EFI image: /boot/mt86+x64
  Found memtest86+ 32bit EFI image: /boot/mt86+ia32
  Found memtest86+ 64bit image: /boot/mt86+x64
  Found memtest86+ 32bit image: /boot/mt86+ia32
  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.
  Found Windows Boot Manager on /dev/nvme1n1p1@/EFI/Microsoft/Boot/bootmgfw.efi
  Adding boot menu entry for UEFI Firmware Settings ...
  error: syntax error.
  error: Incorrect command.
  error: syntax error.
  Syntax error at line 338
  Syntax errors are detected in generated GRUB config file.
  Ensure that there are no errors in /etc/default/grub
  and /etc/grub.d/* files or please file a bug report with
  /boot/grub/grub.cfg.new file attached.
  run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1
  dpkg: error processing package linux-image-7.0.0-13-generic (--configure):
   old linux-image-7.0.0-13-generic package postinst maintainer script subprocess failed with exit status 1
  Errors were encountered while processing:
   linux-image-7.0.0-14-generic
   linux-image-7.0.0-13-generic

  ProblemType: Bug
  DistroRelease: Ubuntu 26.04
  Package: ubuntu-release-upgrader-core 1:26.04.16
  ProcVersionSignature: Ubuntu 7.0.0-13.13-generic 7.0.0-rc7
  Uname: Linux 7.0.0-13-generic x86_64
  ApportVersion: 2.34.0-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 22 20:32:42 2026
  InstallationDate: Installed on 2026-02-03 (78 days ago)
  InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64 (20250805.1)
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDistupgradeTermlog:

  mtime.conffile..etc.update-manager.release-upgrades: 2026-04-15T13:25:26.553685

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