[Bug 1902025] Re: hwe kernel not scoped under "Ubuntu Base"

[William Wilson]

Attached is an SRU for groovy. It groups all kernel packages under
Ubuntu base while safely avoiding the issues in LP: #1912718 and LP:
#1913476. It also introduces a new test for the scenario in LP: #1912718
and cleans up binary files left behind by tests.

** Patch added: "lp1902025_groovy.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1902025/+attachment/5462490/+files/lp1902025_groovy.debdiff

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https://bugs.launchpad.net/bugs/1902025

Title:
  hwe kernel not scoped under "Ubuntu Base"

Status in update-manager package in Ubuntu:
  Fix Released
Status in update-manager source package in Focal:
  Triaged
Status in update-manager source package in Groovy:
  Triaged
Status in update-manager source package in Hirsute:
  Fix Released

Bug description:
  linux-image-generic-hwe-20.04
  linux-headers-generic-hwe-20.04
  linux-generic-hwe-20.04

  Are all listed as standalone updates in update manager, instead they
  should be grouped under Ubuntu Base.

  [Impact]

   * When running update-manager, hwe kernel packages and some other
     kernel packages were not appearing under Ubuntu Base as they should

   * This was causing the section "Other Updates" to appear cluttered

   * Backporting to stable releases because of the visual impact to
  users

  [Test Case]

   * If no updates for kernel related packages are available, downgrade some 
     kernel related packages such as the hwe packages listed in this bug
     report

   * Run update-manager and observe that the kernel packages are not
     grouped under Ubuntu Base

  [Where problems could occur]

   * Packages that don't belong under Ubuntu Base could be grouped under 
     Ubuntu Base if the new regex is too generic.

   * Packages that do belong under Ubuntu Base could be missed if the regex
     does not account for them

  [Other info]

   * In the future it would be best if new packages do not begin with the
     string "linux-" unless they are related to the kernel. This will
     prevent these packages from being accidentally grouped under
     Ubuntu Base

   * Currently there are a few "linux-*" packages that do not belong under
     Ubuntu Base, such as linux-show-player and linux-sound-base.

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