[Bug 1914278] Re: Kernel updates marked as "manually installed", prevents old kernels cleanup

[Michael Mikowski]

@ximion thanks for this substantial work. The list of enhancements looks
impressive. In testing on Jammy where I compare this to the prior
versions, manual and automatic marks are as before which is good. We
haven't confirmed meta package upgrades that pull in new dependencies
(as with kernel packages) because we haven't seen an upgrade yet.
However, we may build a package to test this.

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Title:
  Kernel updates marked as "manually installed", prevents old kernels
  cleanup

Status in apt package in Ubuntu:
  Invalid
Status in discover package in Ubuntu:
  Invalid
Status in packagekit package in Ubuntu:
  Fix Released
Status in unattended-upgrades package in Ubuntu:
  Invalid
Status in apt source package in Jammy:
  Invalid
Status in discover source package in Jammy:
  Invalid
Status in packagekit source package in Jammy:
  Fix Released
Status in unattended-upgrades source package in Jammy:
  Invalid

Bug description:
  With the machines I help administer, we have been finding situations
  where the /boot directory is filling-up beyond 3 kernels on LUKS
  encrypted systems. apt autoremove is not removing old kernels as
  expected.

  This may also be an issue with unattended-upgrades since I found the
  following line commented-out by default:

  // Remove unused automatically installed kernel-related packages
  // (kernel images, kernel headers and kernel version locked tools).
  // Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";

  We have had a system with as many as 15 kernel packages installed as a
  result of this not working as expected.

  The majority of these machines are using Discover to do their package
  upgrading, which uses PackageKit as its backend.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: apt 2.0.4
  ProcVersionSignature: Ubuntu 5.8.0-41.46~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-41-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Tue Feb  2 09:29:01 2021
  InstallationDate: Installed on 2020-11-07 (87 days ago)
  InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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