package kdelibs5-dbg 4:4.6.5-0ubuntu1.1 failed to install/upgrade: ErrorMessage: package kdelibs5-dbg is already installed and configured

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I was trying to upgrade from ubuntu 11.04 to 11.10 and then this error. So I can't upgrade

ProblemType: Package
DistroRelease: Ubuntu 11.10
Package: kdelibs5-dbg 4:4.6.5-0ubuntu1.1
ProcVersionSignature: Ubuntu 2.6.38-16.67-generic 2.6.38.8
Uname: Linux 2.6.38-16-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Fri Nov 9 16:26:59 2012
ErrorMessage: ErrorMessage: package kdelibs5-dbg is already installed and configured
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: dpkg
Title: package kdelibs5-dbg 4:4.6.5-0ubuntu1.1 failed to install/upgrade: ErrorMessage: package kdelibs5-dbg is already installed and configured
UpgradeStatus: Upgraded to oneiric on 2012-11-09 (0 days ago)

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that there was an error on your system when trying to install a particular package. Please execute the following command, as it will clear your package cache, in a terminal:

sudo apt-get clean

Then try performing the update again. This will likely resolve your issue, but the failure could be caused by filesystem or memory corruption. So please also run a fsck on your filesystem(s) and a memory test. Thanks in advance!

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]