package tzdata 2011g-0ubuntu0.11.04 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128

[usrLoulou]

Binary package hint: tzdata

installation issue of ubuntu 11-04 on a vmware with the followin error :
package tzdata 2011g-0ubuntu0.11.04 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: tzdata 2011g-0ubuntu0.11.04
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Sun May 1 08:51:28 2011
ErrorMessage: subprocess installed post-installation script returned error exit status 128
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
SourcePackage: tzdata
Title: package tzdata 2011g-0ubuntu0.11.04 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128
UpgradeStatus: No upgrade log present (probably fresh install)