[Bug 2092526] Re: package flash-kernel 3.107ubuntu13~24.10.1 failed to install/upgrade: installed flash-kernel package post-installation script subprocess returned error exit status 1

[Robin]

Screen grab from synaptic—whose terminal won't let one copy text as
such—showing the failure. Note that kernel is 6.8.0-1035 rather than
6.11, presumably because system is 24.04 LTS rather than 24.10 of
original reporter.

** Attachment added: "Screengrab of terminal in synaptic showing problem"
   https://bugs.launchpad.net/ubuntu/+source/flash-kernel/+bug/2092526/+attachment/5902780/+files/Screenshot%20from%202025-08-27%2013-43-54.png

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https://bugs.launchpad.net/bugs/2092526

Title:
  package flash-kernel 3.107ubuntu13~24.10.1 failed to install/upgrade:
  installed flash-kernel package post-installation script subprocess
  returned error exit status 1

Status in flash-kernel package in Ubuntu:
  Confirmed

Bug description:
  flash-kernel: installing version 6.11.0-1005-raspi
  Taking backup of vmlinuz.
  mv: cannot move '/boot/firmware/vmlinuz' to '/boot/firmware/vmlinuz.bak': Read-o
  nly file system
  run-parts: /etc/initramfs/post-update.d//flash-kernel exited with return code 1
  dpkg: error processing package initramfs-tools (--configure):
   installed initramfs-tools package post-installation script subprocess returned 
  error exit status 1
  Errors were encountered while processing:
   flash-kernel
   initramfs-tools
  Error: Sub-process /usr/bin/dpkg returned an error code (1)

  ProblemType: Package
  DistroRelease: Ubuntu 24.10
  Package: flash-kernel 3.107ubuntu13~24.10.1
  ProcVersionSignature: Ubuntu 6.11.0-1004.4-raspi 6.11.0
  Uname: Linux 6.11.0-1004-raspi aarch64
  ApportVersion: 2.30.0-0ubuntu4
  AptOrdering:
   libmalcontent-0-0:arm64: Install
   libostree-1-1:arm64: Install
   flatpak:arm64: Install
   NULL: ConfigurePending
  Architecture: arm64
  CasperMD5CheckResult: unknown
  CloudArchitecture: aarch64
  CloudID: nocloud
  CloudName: unknown
  CloudPlatform: nocloud
  CloudSubPlatform: config-disk (/dev/nvme0n1p1)
  Date: Thu Dec 26 08:22:32 2024
  ErrorMessage: installed flash-kernel package post-installation script subprocess returned error exit status 1
  ImageMediaBuild: 20241007.1
  Python3Details: /usr/bin/python3.12, Python 3.12.7, python3-minimal, 3.12.6-0ubuntu1
  PythonDetails: N/A
  RebootRequiredPkgs: Error: path contained symlinks.
  RelatedPackageVersions:
   dpkg 1.22.11ubuntu1
   apt  2.9.8
  SourcePackage: flash-kernel
  Title: package flash-kernel 3.107ubuntu13~24.10.1 failed to install/upgrade: installed flash-kernel package post-installation script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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