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[Launchpad Bug Tracker <1675079@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package update-manager - 1:16.04.13

---------------
update-manager (1:16.04.13) xenial; urgency=medium

  * Offer removal of unused autoremovable kernel packages
    (LP: #1624644, #1675079)
  * Support package removals in install backends and really remove packages
    (LP: #1624644, #1675079)
  * Keep PEP 8 checks happy
  * Place .keep files in empty directories to keep them when converting the
    repo to git (LP: #1758963)

 -- Balint Reczey <rbalint@xxxxxxxxxx>  Sun, 25 Mar 2018 20:10:49 +0100

** Changed in: update-manager (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1675079

Title:
  16.04 LTS Partition /boot fills up with Kernel images, gets underwear
  in a twist

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in update-manager package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Xenial:
  New
Status in update-manager source package in Xenial:
  Fix Released
Status in unattended-upgrades source package in Artful:
  New
Status in update-manager source package in Artful:
  Fix Released

Bug description:
  [Impact]

   * Update-manager and unattended-upgrades install many kernel packages during the lifetime of a release but does not remove them automatically leading to those packages filling disk space potentially completely filling /boot and making the system unable to install updates or even boot.
   * Stable release users are impacted by this bug for years and their systems already collected many autoremovable unused kernel packages, thus they would benefit from backporting the fix greatly.
   * The bug is fixed by removing autoremovable (not currently booted) kernel packages when running unattended-upgrades or update-manager. Update manager offers the kernel removals when there are other updates to be installed.

  [Test Case]

   1. Install kernel packages to be removed, mark them auto-installed
  and run apt's kernel hook script to make apt consider them
  autoremovable:

    sudo apt install -y linux-image-extra-4.4.0-92-generic linux-image-extra-4.4.0-93-generic
    sudo apt-mark auto linux-image-extra-4.4.0-92-generic linux-image-extra-4.4.0-93-generic
    sudo /etc/kernel/postinst.d/apt-auto-removal

   2. Also downgrade a package to be upgraded:

     sudo apt-get install -y --allow-downgrades ca-
  certificates=20160104ubuntu1

   3. (update-manager). Run update-manager and observe that kernel
  packages are offered for removal in Details of updates.

    sudo update-manager

   4. (update-manager) Click on Install Now and observe that the kernel
  packages are removed.

   3. (unattended-upgrades) Run unattended-upgrades manually and observe
  the removal of the autoremovable kernel packages:

    sudo unattended-upgrade -v

  [Regression Potential]

   The change may cause update-manager or unattanded-upgrades to remove
  used kernel packages or fail to install other package updates.

  [Other Info]

  The unattended-upgrades fix is uploaded with many other fixes and
  those may cause regressions in other areas in unattended-upgrades.

  [Original bug text]

  On a 16.04LTS system, the /boot partition will eventually fill with
  Kernel images, until the point where "apt-get autoremove" can't
  complete.

  This issue has previously been reported as fixed, but it is not fixed:
  https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1357093

  Generally what I see is the final kernel image that fills the drive is
  incompletely installed (the header package does not make it).  "apt-
  get autoremove" tries to work, but fails.  I must manually remove
  kernel images to free enough space.

  I see this on a machine used by my elderly parents, where 'Download
  and install updates automatically' is set.  And on my home machines,
  where the setting is elsewhere.

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