[Bug 1968154] Re: Only keep 2 kernels

[Łukasz Zemczak]

Can you mention a bit more about the APT::LastInstalledKernel logic
usage removal in this SRU? What was it used before? Since right now this
SRU seems to be dropping its use + only keeping track of 2 kernels, can
you help me understand the implications of that (as I didn't know about
this logic before)?

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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:
  Invalid
Status in apt source package in Bionic:
  New
Status in unattended-upgrades source package in Bionic:
  New
Status in apt source package in Focal:
  New
Status in unattended-upgrades source package in Focal:
  New
Status in apt source package in Impish:
  In Progress
Status in unattended-upgrades source package in Impish:
  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 may need 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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