[Bug 1833124] Re: dh_installman ruins man pages on Minimal Ubuntu

[Kir Kolyshkin]

I guess that debhelper post-install script should at least do this
(taken from "/usr/local/sbin/unminimize"):

if [ "$(dpkg-divert --truename /usr/bin/man)" = "/usr/bin/man.REAL" ]; then \
       rm -f /usr/bin/man; \
       dpkg-divert --quiet --remove --rename /usr/bin/man; \
fi

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Title:
  dh_installman ruins man pages on Minimal Ubuntu

Status in debhelper package in Ubuntu:
  Confirmed

Bug description:
  `dh_installman` uses the `man` program to convert man pages to UTF-8.
  On Minimal Ubuntu images (18.10 and above), /usr/bin/man is replaced
  by a shell script outputting a notice about the lack of man pages and
  the option to "unminimize" the image. Thus, instead of recoding the
  man pages, it replaces all man pages with this output.

  See for example this bug reported against Docker:
  <https://github.com/docker/for-linux/issues/639>

  This has been observed on the minimal versions of cosmic and disco,
  but is likely equally applicable to the minimal version of eoan since
  it, too, includes the /usr/bin/man replacement.

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