[Bug 1914278] Re: apt autoremove is not removing unused kernels

[Balint Reczey]

Please install a few old kernels manually, mark them autoremovable and
run u-u in verbose and debug mode.

If u-u removes those kernels this is not an u-u bug.

Then install those again and try removing them with apt.

If apt removes those kernels than this is not an APT bug.

** Changed in: unattended-upgrades (Ubuntu)
       Status: New => Incomplete

** Changed in: apt (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1914278

Title:
  apt autoremove is not removing unused kernels

Status in apt package in Ubuntu:
  Incomplete
Status in discover package in Ubuntu:
  New
Status in packagekit package in Ubuntu:
  New
Status in unattended-upgrades package in Ubuntu:
  Incomplete

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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