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[Launchpad Bug Tracker <1791959@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package initramfs-tools - 0.130ubuntu3.5

---------------
initramfs-tools (0.130ubuntu3.5) bionic; urgency=medium

  * debian/initramfs-tools.postinst: fix version comparison and
    so it will run for any version earlier than 0.130ubuntu3.5.

initramfs-tools (0.130ubuntu3.4) bionic; urgency=medium

  [ Colin Watson ]
  * [b4804dd] Only sync the filesystem containing the initramfs
    (Closes: #882380) (LP: #1667512)

  [ Tiago Stürmer Daitx ]
  * debian/initramfs-tools.postinst: remove orphaned old-dkms initrd files
    in /boot. (LP: #1791959)

 -- Tiago Stürmer Daitx <tiago.daitx@xxxxxxxxxx>  Thu, 27 Sep 2018
16:21:37 +0000

** Changed in: initramfs-tools (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1791959

Title:
  [SRU] remove orphaned initrd old-dkms files in /boot

Status in initramfs-tools package in Ubuntu:
  Fix Released
Status in initramfs-tools source package in Xenial:
  Fix Committed
Status in initramfs-tools source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  If a dkms package is installed which has REMAKE_INITRD or the same setting has been manually configured by a user then when a kernel is removed its possible for an ".old-dkms" file to be left in /boot with no associated kernel.

  bug 1515513 dealt with removing old-dkms initrd files using the
  kernel's prerm hook, but that is only executed for the kernel version
  being removed: any other old-dkms file generated prior to that would
  not be removed by the hook, taking space in the /boot directory and
  being carried forward with every upgrade.

  Note: Filling up the /boot partition causes updates and upgrades to
  fail.

  [Test Case]
  As the fix for bug 1515513 is available on Xenial and Bionic it is no longer possible to reproduce this by simply installing and updating kernels - dkms 2.2.0.3-2ubuntu11.3/xenial or 2.3-3ubuntu1/bionic would be required for that. In order to replicate it an old dkms file will be created by hand.

  This assumes a new Xenial/Bionic schroot.

  1) create files to work as a placeholders for old dkms files (there are 4 possible namings for these files)
  touch /boot/initrd-4.0.0-0-generic.img.old-dkms /boot/initramfs-4.0.0-0-generic.img.old-dkms /boot/initrd.img-4.0.0-0-generic.old-dkms /boot/initrd-4.0.0-0-generic.old-dkms

  2) install 3 old kernels, r8168-dkms, and the current initramfs-tools
  * xenial:
  apt-get install -y linux-image-4.4.0-21-generic linux-image-4.4.0-22-generic linux-image-4.4.0-24-generic r8168-dkms initramfs-tools=0.122ubuntu8.12
  * bionic:
  apt-get install -y linux-image-4.15.0-32-generic linux-image-4.15.0-33-generic linux-image-4.15.0-34-generic r8168-dkms initramfs-tools=0.130ubuntu3.3

  3) install the headers for the old kernels (forces dkms to run)
  * xenial:
  apt-get install -y linux-headers-4.4.0-21-generic linux-headers-4.4.0-22-generic linux-headers-4.4.0-24-generic
  * bionic:
  apt-get install -y linux-headers-4.15.0-32-generic linux-headers-4.15.0-33-generic linux-headers-4.15.0-34-generic

  4) verify that there are 7 old-dkms, the 4 manually created ones and one for each installed kernel
  ls -1 /boot/*.old-dkms

  5) install the initramfs-tools from proposed that contains this fix
  apt-get install -y initramfs-tools

  6) verify that the manually created old-dkms files were removed and that there are only 3 files now, one for each installed kernel
  ls /boot/*.old-dkms

  7) mark kernel images and headers as automatically installed
  apt-mark auto linux-image-4*-generic linux-headers-4*-generic

  8) autoremove the older kernel
  apt-get autoremove -y

  9) verify that there are now only 2 old-dkms, one for each installed kernel
  ls -1 /boot/*.old-dkms

  
  These steps guarantees that:
  - orphaned old-dkms are correctly removed from /boot
  - non-orphaned old-dkms are kept
  - when kernel is removed the related old-dkms are also deleted

  [Regression Potential]
  Somebody out there might expect the .old-dkms file to be kept, but that seems like an odd expectation.

  One notices *.old-dkms files being left behind still sitting on the
  disk after purging the related kernel. This can cause /boot to become
  full, and when it gets really bad, even sudo apt-get autoremove won't
  fix the problem - only deleting the old-dkms files manually solves the
  problem.

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