[Bug 1821640] Re: Missing pattern for linux-image-unsigned keeps autoremovable kernels on the system

[Balint Reczey]

@vorlon: I tried to explain the advantages of handling versioned kernel packages uniformly in:
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1821640/comments/5

U-u and update-manager use the patterns not just for removal but also
for _protecting_ the running kernel and not autoremoving it, thus having
accurate patterns helps not breaking the system as well.

I'm adding an autopkgtest in u-u to check if every versioned kernel
pattern is covered to not miss any and prevent bugs like LP: #1698159:

https://github.com/mvo5/unattended-upgrades/pull/199

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https://bugs.launchpad.net/bugs/1821640

Title:
  Missing pattern for linux-image-unsigned keeps autoremovable kernels
  on the system

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Xenial:
  In Progress
Status in apt source package in Bionic:
  In Progress
Status in apt source package in Cosmic:
  Incomplete
Status in apt source package in Disco:
  Fix Committed
Status in apt source package in Eoan:
  Fix Released

Bug description:
  [Impact]
  Unattended-upgrades keeps versioned kernel packages because they don't match known kernel package patterns:

  ...
  Keeping auto-removable linux-modules-4.18.0-14-generic package(s) because it would also remove the following packages which should be kept in this step: linux-image-unsigned-4.18.0-14-generic
  ...

  For reproduction see LP: #1795696, but running u-u with --verbose.

  And APT does not apply proper kernel-version based protection to it.

  [Test case]
  linux-image-unsigned should popup in the same list in 01autoremove-kernels as linux-signed-image, and should be autoremovable iff it's signed counterpart is autoremovable.

  [Regression potential]
  Not really any, it's just an additional string in the entry. The only difference really possible therefore is that the set of autoremovable packages changes and unattended-upgrades and friends might autoremove different sets of them.

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