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

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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)

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal third-party-packages
-- 
libc6 package version 2.31-0ubuntu9.1 in ubuntu 20.04.1 - no traces of where it came from
https://bugs.launchpad.net/bugs/1911073
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