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

[Ian Wienand]

For anyone else finding this and wondering what the implications are;
from what I could find:

It seems that 2.31-0ubuntu9.3 was released for
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1914044 but as
noted in
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1914044/comments/18
"This fix proved to be too intrusive to be released via focal-updates."
hence it was pulled.

We have several production systems that have upgraded to this via
unattended-upgrades.  Only on one did we notice the conflict when we
installed some backup things that pulled in libc6-dev (via build-
essential for a python lib dependency).

You'll have to make up your own mind, but looking at the changelog
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1914044/comments/14
downgrading doesn't seem like much of a problem.  If you don't need to
install libc6-dev you can just wait for 2.31-0ubuntu9.4 I guess (but
then it would be unlikely you're reading this ... so ... :)

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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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