[ubuntu] VirtualBox - How to get back to Oracle version

Hi all,

Host Ubuntu 12.04 64bit
Guest Ubuntu 12.04 b4bit
Virtualbox, Oracle

Receently after upgrade Virtualbox it is discovered the version of VirtualBox changed to Ubuntu version NOT Oracle version resulting in unable installing Oracle GuestAddition on VM. Please advise is there any way getting back to Oracle version rather than reinstall the PC. Thanks

Rgds
satimis