[Bug 2001568] Re: unattended-upgrades 2.9.1+nmu2ubuntu1 failing autopkgtest on arm64

[Ubuntu Foundations Team Bug Bot]

** Tags added: patch

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https://bugs.launchpad.net/bugs/2001568

Title:
  unattended-upgrades 2.9.1+nmu2ubuntu1 failing autopkgtest on arm64

Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  u-u is currently failing autopkgtest on arm64. It does not look like
  this is a new failure (2.8ubuntu1 appears to have had exactly the same
  failure) but it's due to the kernel-patterns test assuming that kernel
  flavors cannot be a suffix of each other. This is true under Debian,
  and under several architectures on Ubuntu, but the arm64 architecture
  on Ubuntu has -generic and -generic-64k flavors which cause the test
  to fail.

  The attached debdiff corrects the test for this case.

  One may wonder why the test currently passes under armhf, which has
  -generic and -generic-lpae flavors (I certainly did!). It turns out
  this is only because Ubuntu autopkgtest runs armhf in a container so
  the kernel release reported by "uname -r" (used in the test) does not
  meaningfully match anything in the apt cache.

  Given this, the attached debdiff also restricts the kernel-patterns
  test to isolation-machine as the test assumes a meaningful link
  between the running kernel and the packages in the archive which is
  only true in a VM or on the bare metal.

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