How To: Upgrading to Ubuntu 9.04 From 8.10

How do I upgrade my Ubuntu 8.10 (Intrepid Ibex) desktop to latest Ubuntu Linux 9.04 (Jaunty Jackalope) over the Internets?

Ubuntu Linux support direct upgrade Ubuntu 9.04 from Ubuntu 8.10.
Make sure you have all updates applied to Ubuntu 8.10 before you start upgrade. To do this visit:
System -> Administration -> Update Manager

Ubuntu Update Manager

Click on "Install Updates"

Network Upgrade for Ubuntu Desktops over the Network

You can easily upgrade over the network as follows:
Visit System > Administration > Update Manager
Click the Check button to check for new updates.
A message will appear informing you of the availability of the new release.

Click Upgrade.
Follow the on-screen instructions.