[Bug 1926918] Re: cannot install libc6-dev, requires old libc6 version

[Jim Salter]

Balint, what is the accepted method to downgrade an installed package to
a prior version? I can think of three or four ways to accomplish it, but
I can think of ways it could bite me in the butt having done so just as
easily. :)

This is especially a problem for this particular package, because simply
removing libc6 would break enormous swathes of the system...

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https://bugs.launchpad.net/bugs/1926918

Title:
  cannot install libc6-dev, requires old libc6 version

Status in glibc package in Ubuntu:
  In Progress

Bug description:
  Current version of libc6:amd64 in Focal is 2.31-0ubuntu9.3. libc6-dev
  requires 2.31-0ubuntu9.2 **only**. This prevents installation of
  libc6-dev (as originally discovered while trying to install build-
  essential, which also requires libc6-dev).

  ~~~~
  root at nel-lg-gram:/home/nel# apt -f install libc6-dev
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies:
   libc6-dev : Depends: libc6 (= 2.31-0ubuntu9.2) but 2.31-0ubuntu9.3 is to be installed
  E: Unable to correct problems, you have held broken packages.
  root at nel-lg-gram:/home/nel# dpkg --get-selections | grep libc6
  libc6:amd64					install
  libc6-dbg:amd64					install
  root at nel-lg-gram:/home/nel# apt policy libc6
  libc6:
    Installed: 2.31-0ubuntu9.3
    Candidate: 2.31-0ubuntu9.3
    Version table:
   *** 2.31-0ubuntu9.3 100
          100 /var/lib/dpkg/status
       2.31-0ubuntu9.2 500
          500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
       2.31-0ubuntu9 500
          500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
  ~~~~

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: libc6-dev (not installed)
  ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-50-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Sun May  2 17:58:02 2021
  InstallationDate: Installed on 2020-10-31 (183 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: glibc
  UpgradeStatus: No upgrade log present (probably fresh install)

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