[Bug 1888241] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for ubiquity has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1888241

Title:
  OEM metapackages added after the ISO was created are not found by the
  installer

Status in ubiquity package in Ubuntu:
  Fix Released
Status in ubiquity source package in Focal:
  Fix Released

Bug description:
  [ Description ]

  If a piece of hardware is enabled after the latest Ubuntu release is
  created, it is not found by the installer and so people who install
  Ubuntu do not get its extra hardware enablement.

  The information the installer needs to know about hardware enablement
  is represented in the Ubuntu archive by "OEM enablement metapackages";
  that is, packages called oem-*-meta which the installer can match (via
  modaliases) to the running hardware. After release, these are SRUed
  into -updates more or less as normal. The installer needs to 'apt
  update' before running 'ubuntu-drivers list-oem' to learn the latest
  state.

  [ QA ]

  1. Boot the focal **release** (20.04.0) live session on a newly-enabled SKU **which has its oem-meta package in focal-updates**.
  2. *Without updating the apt indexes*, install this SRU, i.e. download it and use "dpkg -i".

  [[ QA 1 ]]
  3. Try to install normally. Get online when the wifi page prompts you to. Make sure that the oem-<sku>-meta package is installed.

  [[ QA 2 ]]
  3. Do not connect to the internet. Make sure that the install completes (OEM enablement packages will not be installed; work to do this in the session coming soon).

  [[ QA 3 ]]
  3. Connect to the internet before launching the installer. Make sure that the oem-<sku>-meta package gets installed.

  [[ QA 4 ]]

  3. Connect to the internet when prompted. Uncheck 'download updates
  while installing Ubuntu' and ensure that the OEM meta package gets
  installed.

  [[ QA 5 ]]

  This one can be done on a non-OEM device. Here we're checking that the
  'apt update' didn't mess things up.

  3. Uncheck 'download updates while installing Ubuntu' and ensure that
  it's respected, i.e. that the installed system still offers all the
  SRUs as updates.

  [[ QA 6 ]]

  3. Check the KDE installer still works, i.e. do this on Kubuntu.

  [ Regression potential ]

  This now more-or-less unconditionally runs the equivalent of 'apt
  update' from the installer.

  1. It'll slow down the install a bit. But shouldn't be too bad, since
  only post-release pockets will have changed. If you're online before
  you start ubiquity it will be less noticable since it is done in the
  background. If you get online from the installer then there will be a
  short delay.

  2. Perhaps some part of the installer gets sad or installs the wrong
  thing if you've update the apt indexes. We have a check box 'download
  updates while installing ubuntu' that should still be respected.

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