Convert Ubuntu Server 9.04 to Virtual Machine

Now system running OS Ubuntu 9.04 and App (Web service) on Physical H/W (dell server R300) ........... So i need to convert to on vmware esxi.....

I do solution
1. vmware cold clone : error unknonw platform

2. vmware vconvert 3.5/ 4.2 /4.3 /5.0/ 5.5 : error between converter



If you can advise me for this solve problem .....