How to switch between installed Java VM in Ubunutu

Java Mascot

Imagine you have installed both IcedTea and Oracle (Sun) JVM and you want to switch to Sun JVM from IcedTea. This can be done with command 'update-alternatives --config java' as root.

How to fix Oracle VirtualBox Ubuntu 11.04 Unity Hardware Requirement Issue

Oracle VirtualBox VM boot Screen

Unity is the new desktop package which is included in Ubuntu 11.04. How ever this makes small problem to VirtualBox testers for Ubuntu. It gives small error contains hardware is not support and Unity is kept disabled.