package libqtcore4 4:4.8.1-0ubuntu4.1 failed to install/upgrade: conffile './etc/xdg/Trolltech.conf' is not in sync with other instances of the same package

[ist]

apt-get install ia32-libs

Ubuntu 12.04 LTS, x64
libqtcore4:i386 4:4.8.1-0ubuntu4.1

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: libqtcore4 4:4.8.1-0ubuntu4.1
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic 3.2.18
Uname: Linux 3.2.0-25-generic x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Thu Jun 21 18:33:28 2012
ErrorMessage: conffile './etc/xdg/Trolltech.conf' is not in sync with other instances of the same package
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: qt4-x11
Title: package libqtcore4 4:4.8.1-0ubuntu4.1 failed to install/upgrade: conffile './etc/xdg/Trolltech.conf' is not in sync with other instances of the same package
UpgradeStatus: Upgraded to precise on 2012-05-14 (38 days ago)
modified.conffile..etc.xdg.Trolltech.conf:
 [qt]
 4.8\libraryPath=/usr/lib/kde4/plugins
mtime.conffile..etc.xdg.Trolltech.conf: 2012-04-11T12:57:48