[Bug 1902955] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for glibc has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1902955

Title:
  package libc6:amd64 2.31-0ubuntu9.1 failed to install/upgrade: package
  libc6:amd64 2.31-0ubuntu9.1 cannot be configured because libc6:i386 is
  at a different version (2.27-3ubuntu1.3)

Status in glibc package in Ubuntu:
  Fix Released
Status in glibc source package in Focal:
  Fix Committed
Status in glibc source package in Groovy:
  Fix Committed

Bug description:
  [Impact]

  * libc6 configuration error is observed during release upgrade from
  Bionic to Focal.

  [Test Case]

  * Copy the fixed package to a PPA and set up using the PPA on the Bionic system.
  * Break perl:

  $ mv /usr/bin/perl /usr/bin/perl.bak

  * Try upgrade to the fixed glibc binary packages

  $ do-release-upgrade --allow-third-party
  ...

  * The not fixed libc6 will show this error:

  Checking init scripts...
  /var/lib/dpkg/tmp.ci/preinst: 435: /var/lib/dpkg/tmp.ci/preinst: db_version: not found
  dpkg: error processing archive /tmp/apt-dpkg-install-rAF9HC/3-libc6_2.31-0ubuntu9.1_i386.deb (--unpack):
   new libc6:i386 package pre-installation script subprocess returned error exit status 127
  Selecting previously unselected package libcrypt1:i386.

  * With the fixed libc6 this error is not shown, maybe a different
  error shows up later due to broken perl.

  [Where problems could occur]

  * The fix is testing for the debconf interface properly, like it is
  done at many other places in preinst. It is unlike to cause problems,
  also the affected line is rarely executed.

  [Original Bug Text]

  Ubuntu popped up the system problem window after upgdade to 20 LTS=.

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: libc6:amd64 2.31-0ubuntu9.1
  ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Nov  4 21:17:23 2020
  ErrorMessage: package libc6:amd64 2.31-0ubuntu9.1 cannot be configured because libc6:i386 is at a different version (2.27-3ubuntu1.3)
  InstallationDate: Installed on 2015-03-08 (2068 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.2ubuntu0.1
  SourcePackage: glibc
  Title: package libc6:amd64 2.31-0ubuntu9.1 failed to install/upgrade: package libc6:amd64 2.31-0ubuntu9.1 cannot be configured because libc6:i386 is at a different version (2.27-3ubuntu1.3)
  UpgradeStatus: No upgrade log present (probably fresh install)

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