[Bug 1988819] Re: When apt keeps back packages due to phased updates, it should list them separately

[Julian Andres Klode]

@jwms It's particularly difficult to get the message correctly, the
feature is known as "phased updates", hence it's worded such that you
can search "Ubuntu phasing" and get decent results. If we set "staged
rollout", you could not find results for it. A "phased rollout" might
work.

If we literally said "The following phased updates will become available
soon" or something, we'd run afoul of terminology issues: In APT we say
"upgrades", not "updates" ("update" updates the metadata), and I did not
want to introduce "Phased upgrades" as secondary vernacular.

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Title:
  When apt keeps back packages due to phased updates, it should list
  them separately

Status in apt package in Ubuntu:
  Fix Released

Bug description:
  After phased updates have been introduced, it may happen that apt
  upgrade shows packages as upgradable but ends up not upgrading them.
  In this case the packages are indicated as being "kept back".

  Unfortunately, the feedback provided about this to the user is not
  very informative. The user sees the packages being kept back and
  thinks something is going wrong on the system.

  When packages are kept back because of phased updates, apt should say
  so e.g., it should say that the upgrade is delayed.

  Incidentally note that aptitude does not respect phased updates.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: apt 2.4.7
  ProcVersionSignature: Ubuntu 5.15.0-47.51-generic 5.15.46
  Uname: Linux 5.15.0-47-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Tue Sep  6 10:05:14 2022
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2020-02-16 (933 days ago)
  InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  SourcePackage: apt
  UpgradeStatus: Upgraded to jammy on 2022-06-03 (94 days ago)

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