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

https://bugs.launchpad.net/ubuntu/+source/zentyal-core/+filebug/632cd7d2-82ce-11e1-911a-002481e7f48a?field.title=package%20zentyal-core%202.3.4%20failed%20to%20install/upgrade%3A%20ErrorMessage%3A%20subprocess%20installed%20post-installation%20script%20returned%20error%20exit%20status%208

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: zentyal-core 2.3.4
ProcVersionSignature: Ubuntu 3.2.0-22.35-generic-pae 3.2.14
Uname: Linux 3.2.0-22-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0-0ubuntu4
Architecture: i386
Date: Tue Apr 10 06:10:09 2012
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 8
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
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 2012-04-10 (0 days ago)