[Bug 874030] Re: package libc6 2.13-0ubuntu13 failed to install/upgrade: ErrorMessage: package libc6 is already installed and configured

[osprey]

The libc6 package was not successfully upgraded during the distribution upgrade process.
Rerunning the install by hand using the command
apt-get install --reinstall libc6
turned out that the upgrade failed because another copy of the libc was found in place

A copy of the C library was found in an unexpected directory:
  '/lib/libc-2.12.1.so.back'
It is not safe to upgrade the C library in this situation;
please remove that copy of the C library or get it out of
'/lib' and try again.

so I had to move the followin files out of /lib

libc-2.12.1.so
libdl-2.12.1.so
libm-2.12.1.so
libpthread-2.12.1.so
librt-2.12.1.so

after that I successfully ran the reinstall command which also performed the following tasks
(Reading database ... 246367 files and directories currently installed.)
Preparing to replace libc6 2.13-0ubuntu13 (using .../libc6_2.13-20ubuntu5_i386.deb) ...
Unpacking replacement libc6 ...
Setting up libc6 (2.13-20ubuntu5) ...
Setting up libc6-dev (2.13-20ubuntu5) ...
Setting up libusb-dev (2:0.1.12-18) ...
Setting up libusb-1.0-0-dev (2:1.0.8-4) ...
Setting up lsb-core (4.0-0ubuntu16) ...
Setting up libstdc++6-4.6-dev (4.6.1-9ubuntu3) ...
Setting up libstdc++6-4.5-dev (4.5.3-9ubuntu1) ...
Setting up libusb++-dev (2:0.1.12-18) ...
Setting up g++-4.6 (4.6.1-9ubuntu3) ...
Setting up g++ (4:4.6.1-2ubuntu5) ...
Setting up g++-4.5 (4.5.3-9ubuntu1) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place

After that I restarted the machine and it worked without problem

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https://bugs.launchpad.net/bugs/874030

Title:
  package libc6 2.13-0ubuntu13 failed to install/upgrade: ErrorMessage:
  package libc6 is already installed and configured

Status in “dpkg” package in Ubuntu:
  New

Bug description:
  While upgrading from ubuntu 11.04 to 11.10 I've got this error.
  I'll try to submit more informations as soon as the upgrade will finish

  ProblemType: Package
  DistroRelease: Ubuntu 11.10
  Package: libc6 2.13-0ubuntu13
  ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic i686
  ApportVersion: 1.23-0ubuntu3
  Architecture: i386
  Date: Fri Oct 14 11:22:43 2011
  ErrorMessage: ErrorMessage: package libc6 is already installed and configured
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  SourcePackage: dpkg
  Title: package libc6 2.13-0ubuntu13 failed to install/upgrade: ErrorMessage: package libc6 is already installed and configured
  UpgradeStatus: Upgraded to oneiric on 2011-10-14 (0 days ago)

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