[Bug 1960749] Re: dpkg incorrectly installs singular-doc in jammy Docker container

[Julian Andres Klode]

This is a feature, not a bug.

Docker images are not intended for interactive use, as such use
minimized images, and dpkg is configured to not install any
documentation.

A script 'unminize' is provided to convert a minimized image into a full
one.

root at 3a7cdb2c772b:/# cat /etc/dpkg/dpkg.cfg.d/excludes
# Drop all man pages
path-exclude=/usr/share/man/*

# Drop all translations
path-exclude=/usr/share/locale/*/LC_MESSAGES/*.mo

# Drop all documentation ...
path-exclude=/usr/share/doc/*

# ... except copyright files ...
path-include=/usr/share/doc/*/copyright

# ... and Debian changelogs for native & non-native packages
path-include=/usr/share/doc/*/changelog.*

** Changed in: dpkg (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1960749

Title:
  dpkg incorrectly installs singular-doc in jammy Docker container

Status in dpkg package in Ubuntu:
  Invalid

Bug description:
  Also reported on https://github.com/tianon/docker-brew-ubuntu-
  core/issues/230

  Using official Jammy image in Docker (macOS) and Podman (Fedora).
  In both cases, using CLI in the image and running

  apt install singular-doc
  dpkg -V singular-doc
  reports a lot of missing files. In fact, the only present files are dangling links to missing files in the package.
  The package itself is not broken - extracting it in Jammy not in Docker/Podman (say, in an lxc container) works.
  And extracting it in Debian/bookworm CLI run in Docker works too.

  As well, the same behaviour is observed using the corresponding
  singular-doc_4.2.1-p3+ds-1_all.deb file, and installing it using dpkg
  -i. This points to dpkg as the culprit.

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