SD+ update 6003 to 6006 failed

Hello,

i am trying to upgrade our linux installation of SD+ version 6003 installed on a remote MSSQL2005 database to the latest version 6006.

I have downloaded the ppm file and ran the Updater. It start fine and starts updating the software, however at around 98% the update fails and rolls back the old software. The Rlogfile in the Patch folder shows the following:

stefan@SERVERNAME:/opt/AdventNet/ME/ServiceDesk/Patch/logs$ more AdventNet_ManageEngine_ServiceDesk_Plus-6.0.0-SP-AdventNet_ManageEngine_ServiceDesk_Plus-6.0.0-SP-28.0SERVICEDESKRlog.txt
server/default/lib/AdventNetPersistence.jar
server/default/lib/SDUtils.jar
server/default/conf/buildInfo.xml
server/default/conf/update_conf.xml
bin/UpdateManager.bat
bin/backUpData.sh
bin/restoreData.bat
bin/UpdateManager.sh
bin/stopDB.sh
bin/startDB.bat
bin/backUpData.bat
bin/startDB.sh
bin/stopDB.bat
bin/run.sh
bin/restoreData.sh
bin/setcommonenv.bat
bin/run.bat
bin/setcommonenv.sh
lib/ADAuth.dll
lib/SDeskWmi.dll
conf/update_conf.xml
license/LICENSE

what has gone wrong here and why can I upgrade?
stefan.