[Bug 2037905] Re: package docker.io (not installed) failed to install/upgrade: tentative de remplacement de « /usr/bin/docker », qui appartient aussi au paquet podman-docker 4:4.6.2-0ubuntu22.04+obs81.12

[Launchpad Bug Tracker]

This bug was fixed in the package docker.io-app -
28.2.2-0ubuntu1~25.04.1

---------------
docker.io-app (28.2.2-0ubuntu1~25.04.1) plucky; urgency=medium

  * Backport from questing to plucky (LP: #2112523)

docker.io-app (28.2.2-0ubuntu1) questing; urgency=medium

  * New upstream version 28.2.2
  * d/h/build-manpages.sh: adjust manpage build script to upstream changes
  * d/manpages/*: update manpages for version 28.2.2
  * d/docker.io.docs: update NOTICE files
  * d/copyright: update copyright data

docker.io-app (27.5.1-0ubuntu4) questing; urgency=medium

  * d/control: conflicts/replaces podman-docker (LP: #2037905)

 -- Athos Ribeiro <athos.ribeiro at canonical.com>  Tue, 09 Sep 2025
21:35:07 -0300

** Changed in: docker.io-app (Ubuntu Plucky)
       Status: Fix Committed => Fix Released

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Title:
  package docker.io (not installed) failed to install/upgrade: tentative
  de remplacement de « /usr/bin/docker », qui appartient aussi au paquet
  podman-docker 4:4.6.2-0ubuntu22.04+obs81.12

Status in apt package in Ubuntu:
  Won't Fix
Status in docker.io-app package in Ubuntu:
  Fix Released
Status in docker.io-app source package in Jammy:
  Fix Released
Status in docker.io-app source package in Noble:
  Fix Released
Status in docker.io-app source package in Oracular:
  Won't Fix
Status in docker.io-app source package in Plucky:
  Fix Released

Bug description:
  [ Impact ]

  Both docker.io-app and podman-docker packages ship a /usr/bin/docker
  file. Docker.io does not include a conflicts relation with podman-
  docker, but podman-docker includes that relation (Conflicts/Replaces
  docker.io/docker-cli).

  apt/apt-get behaves correctly in all supported releases when
  installing one package over the other. Therefore, there is no greater
  impact here unless the user (as happened with the original report)
  decides to use a custom podman-docker package build without the
  Conflics/Replaces relation.

  In other words, this bug does not really affect regular usage of these
  packages for stable releases. Nevertheless, we are backporting this
  fix to plucky/noble/jammy with the next container stack backport batch
  for correctness.

  [ Test Plan ]

  Install docker.io.
  Install podman-docker.
  Verify that the package was correctly installed and docker.io was removed.

  Install podman-docker
  Install docker.io
  Verify that the package was correctly installed and podman-docker was removed.

  [ Where problems could occur ]

  This adds a new Conflicts/Replaces relation in the package. Unless new
  packages providing the conflicting capabilites in the archive (and
  only in the case the new capabilities are not really conflicting),
  regressions should be checked elsewhere first. Otherwise, reverting
  this change should be straightforward and should be generally OK given
  the other conflicting counterpart already carries the relation.

  [ Other Info ]

  As mentioned by Julian in the comments, the new apt solver will
  protect manually installed packages against removals due to
  Conflicts/Breaks (when not using apt-get). Users using the new solver
  will still face an issue when trying to replace one of the packages,
  but the error message should include a good explanation of the
  conflict. Users should either remove the conflicting package in the
  same install operation (using a "-") or use apt-get. ATM, this only
  applies to Ubuntu >= 25.10

  [ Original Message ]

  ProblemType: Package
  DistroRelease: Ubuntu 22.04
  Package: docker.io (not installed)
  ProcVersionSignature: Ubuntu 6.2.0-33.33~22.04.1-generic 6.2.16
  Uname: Linux 6.2.0-33-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Sun Sep 24 18:01:40 2023
  ErrorMessage: tentative de remplacement de « /usr/bin/docker », qui appartient aussi au paquet podman-docker 4:4.6.2-0ubuntu22.04+obs81.12
  InstallationDate: Installed on 2022-11-19 (316 days ago)
  InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
  Python3Details: /usr/bin/python3.10, Python 3.10.12, python3-minimal, 3.10.6-1~22.04
  PythonDetails: /usr/bin/python3.10, Python 3.10.12, python-is-python3, 3.9.2-2
  RelatedPackageVersions:
   dpkg 1.21.1ubuntu2.2
   apt  2.4.10
  SourcePackage: docker.io-app
  Title: package docker.io (not installed) failed to install/upgrade: tentative de remplacement de « /usr/bin/docker », qui appartient aussi au paquet podman-docker 4:4.6.2-0ubuntu22.04+obs81.12
  UpgradeStatus: No upgrade log present (probably fresh install)

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