[Bug 1911073] Re: libc6 package version 2.31-0ubuntu9.1 in ubuntu 20.04.1 - no traces of where it came from

[Ubuntu Foundations Team Bug Bot]

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Title:
  libc6 package version 2.31-0ubuntu9.1 in ubuntu 20.04.1 - no traces of
  where it came from

Status in apt package in Ubuntu:
  New

Bug description:
  I installed `Ubuntu 20.04.1 LTS` few weeks ago. So it's almost fresh
  install.

  I can't install libc6-dev:

      The following packages have unmet dependencies:
        libc6-dev : Depends: libc6 (= 2.31-0ubuntu9) but 2.31-0ubuntu9.1 is to be installed

  Here's what version the `-dev` package is:

      $ apt show libc6-dev
      Version: 2.31-0ubuntu9
      Depends: libc6 (= 2.31-0ubuntu9), libc-dev-bin (= 2.31-0ubuntu9), linux-libc-dev, libcrypt-dev

  `Depends: libc6 (= 2.31-0ubuntu9)` looks good to me.

  apt-cache shows libc version is ok:

      $ apt-cache show libc6
      Version: 2.31-0ubuntu9

  
  However, `apt` differs:

      $ apt show libc6
      Version: 2.31-0ubuntu9.1

  apt can not tell where this version comes from `focal/main`:

      $ apt policy libc6
      libc6:
        Installed: 2.31-0ubuntu9.1
        Candidate: 2.31-0ubuntu9.1
        Version table:
       *** 2.31-0ubuntu9.1 100
              100 /var/lib/dpkg/status
           2.31-0ubuntu9 500
              500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

  9.1 can only be found in `/var/lib/dpkg/status` however, neither in
  packages here: `http://us.archive.ubuntu.com/ubuntu/dists/focal/main
  /binary-amd64/` nor in `/var/lib/apt/lists/us.archive.ubuntu
  .com_ubuntu_dists_focal_main_binary-amd64_Packages` version
  `2.31-0ubuntu9.1` does not exist.

  Upgrade can be seen in the logs:

      2021-01-02 21:02:03 startup archives unpack
      2021-01-02 21:02:03 upgrade libc6:amd64 2.31-0ubuntu9 2.31-0ubuntu9.1
      2021-01-02 21:02:03 status half-configured libc6:amd64 2.31-0ubuntu9
      2021-01-02 21:02:03 status unpacked libc6:amd64 2.31-0ubuntu9
      2021-01-02 21:02:03 status half-installed libc6:amd64 2.31-0ubuntu9
      2021-01-02 21:02:03 status unpacked libc6:amd64 2.31-0ubuntu9.1
      2021-01-02 21:02:04 startup packages configure
      2021-01-02 21:02:04 configure libc6:amd64 2.31-0ubuntu9.1 <none>
      2021-01-02 21:02:04 status unpacked libc6:amd64 2.31-0ubuntu9.1
      2021-01-02 21:02:04 status half-configured libc6:amd64 2.31-0ubuntu9.1
      2021-01-02 21:02:04 status installed libc6:amd64 2.31-0ubuntu9.1

  Is there a legitimate ubuntu repository with this package? How can I
  find the repository name where this package really came from?

  What worries me is md5s hash of this package is
  `1ec728d58f7fc0d302119e9bb53050f8` which can only be found on
  ropshell.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: apt 2.0.2ubuntu0.2
  ProcVersionSignature: Ubuntu 5.8.0-36.40~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-36-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Jan 11 18:44:00 2021
  InstallationDate: Installed on 2021-01-03 (8 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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