package zentyal-core 2.3.4 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 8

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this bug affect me on upgrading from 11.10 to 12.04 ubuntu

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: zentyal-core 2.3.4
ProcVersionSignature: Ubuntu 3.2.0-20.33-generic-pae 3.2.12
Uname: Linux 3.2.0-20-generic-pae i686
NonfreeKernelModules: fglrx
ApportVersion: 1.95-0ubuntu1
Architecture: i386
Date: Fri Mar 30 15:54:08 2012
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 8
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
SourcePackage: zentyal-core
Title: package zentyal-core 2.3.4 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 8
UpgradeStatus: Upgraded to precise on 2012-03-30 (0 days ago)