[Bug 1968154] Re: Only keep 2 kernels

[Launchpad Bug Tracker]

This bug was fixed in the package apt - 2.4.5

---------------
apt (2.4.5) unstable; urgency=medium

  * Only protect two kernels, not last installed one (LP: #1968154)
  * Fix segfault in CacheSetHelperAPTGet::tryVirtualPackage()

 -- Julian Andres Klode <jak at debian.org>  Fri, 08 Apr 2022 12:22:23
+0200

** Changed in: apt (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1968154

Title:
  Only keep 2 kernels

Status in apt package in Ubuntu:
  Fix Released
Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  [Impact]
  APT currently keeps 3 kernels or even 4 in some releases. Our boot partition is sized for a steady state of 2 kernels + 1 new one being unpacked, hence users run out of space and new kernels fail to install, upgrade runs might abort in the middle. It's not nice.

  [Test plan]
  1. Have two kernels installed (let's call them version 3, 2)
  2. Check that both kernels are not autoremovable
  3. Install an old kernel (let's call it 1), and mark it automatic
  4. Check that 1 will be autoremovable (apt autoremove -s)
  5. Reboot into 1, check that 2 is autoremovable (apt autoremove -s)
  6. Actually remove 2
  7. Reboot into 3 and check that both 1 and 3 are now not autoremovable

  unattended-upgrades needs changes to its test suite to accommodate
  this.

  [Where problems could occur]
  We could keep the wrong kernels installed that the user did not expect.

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