package qt4-doc 4:4.7.2-0ubuntu6.2 failed to install/upgrade: short read on buffer copy for backend dpkg-deb during `./usr/share/qt4/doc/qch/qt.qch'

[Walker]

it asks to update and it fails

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: qt4-doc 4:4.7.2-0ubuntu6.2
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
AptOrdering:
 qt4-doc: Install
 qt4-doc: Configure
Architecture: amd64
Date: Wed Oct 12 18:23:10 2011
Dependencies:

ErrorMessage: short read on buffer copy for backend dpkg-deb during `./usr/share/qt4/doc/qch/qt.qch'
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
PackageArchitecture: all
SourcePackage: qt4-x11
Title: package qt4-doc 4:4.7.2-0ubuntu6.2 failed to install/upgrade: short read on buffer copy for backend dpkg-deb during `./usr/share/qt4/doc/qch/qt.qch'
UpgradeStatus: Upgraded to natty on 2011-10-07 (5 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.]