To upgrade from Ubuntu 8.10 on a desktop system, press Alt+F2 and type in "update-manager -d" (without the quotes) into the command box. Update Manager should open up and tell you: New distribution release '9.04' is available. Click Upgrade and follow the on-screen instructions.
To upgrade from Ubuntu 8.10 on a server system: install the update-manager-core package if it is not already installed; edit /etc/update-manager/release-upgrades and set Prompt=normal; launch the upgrade tool with the command sudo do-release-upgrade; and follow the on-screen instructions.
If you choose to download the iso be sure to backup your home directory to another partition and checkout ext4 filesystem for improved performance.
Here are the new features since intrepid:
- GNOME 2.26 - For a Good review of the gnome changes look here
- Improved handling of multiple monitors with an updated gnome-display-properties by Federico Mena Quintero.
- X.Org server 1.6
- New style for notifications and notification preferences - for an example check out the flash video here
- Boot performance - A number of improvements to the Ubuntu start-up process bring significantly improved boot performance to Ubuntu 9.04 Beta. Please open bugs if you experience any degradation, and tag them with boot-performance.
- Ext4 filesystem support - One of my favorite additions, it improves boot performance and overall filesystem performance
- There is a ton of other bug fixes and misc features added, Its been stable for me since alpha 3.
Get it while it's hot. ISOs and torrents are available at:
- http://releases.ubuntu.com/releases/9.04/ (Ubuntu Desktop and Server)
http://releases.ubuntu.com/releases/edubuntu/9.04/ (Ubuntu Education Edition)
http://cdimage.ubuntu.com/releases/9.04/beta/ (Ubuntu Netbook Remix and Ubuntu MID)
http://cdimage.ubuntu.com/netboot/9.04/beta/ (Ubuntu ARM)