[Bug 2080239] Re: Software Updater "up to date" message is misleading with phasing

[Julian Andres Klode]

The release upgrader already ignores phasing updates when considering
whether all updates are installed, at least for the do-release-upgrade
entry point:

  upgradable = [pkg for pkg in cache if pkg.is_upgradable]
  for pkg in upgradable:
    if 'Phased-Update-Percentage' in pkg.candidate.record:
      # P-U-P does not exist if it is fully phased
      continue
    else:
      install_count += 1
      # one upgradeable package is enough to stop the dist-upgrade
      break
  if install_count > 0:
    if not options.quiet:
      print(_("Please install all available updates "
              "for your release before upgrading."))

Hence you only see this issue when there are no-longer-phased updates
missing. However, there might of course be issues there in case an
update that finished phasing depends on another update that is still
phasing - it is then being kept back because its dependencies can't be
satisfied.

This is not a very common issue, and very likely not the one in the
example.

If you have a *specific* instance of the issue, specifically ones that
are not in the described failure case, we are going to need a
/var/lib/dpkg/status and /var/lib/apt/lists and /etc/apt attached to the
bug report.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2080239

Title:
  Software Updater "up to date" message is misleading with phasing

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  Software Update is confusing some users by:

  - Claiming that software is up-to-date, and offering a release-upgrade
  - Failing to install the selected release-upgrade due to phased updates.

  Example showing the issue in Ubuntu 22.04:
  https://askubuntu.com/questions/1526235/upgrade-button-from-software-
  updater-doesnt-work/1526256

  
  Software Update "upgrade" selection (and do-release-upgrade) might ignore phasing, as those phasing packages may be replaced.

  Alternately, Software Update should be aware of phasing. It should not
  offer a release-upgrade during phasing, or might offer an alternative
  message "available soon".

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