We have seen how to update the desktop edition (Desktop) of the new Ubuntu 9.04. simply from terminal run update-manager -d
Updating the server edition is also easy.

Install the update manager with:

sudo apt-get install update-manager-core

Edit its configuration file

sudo gedit /etc/update-manager/release-upgrades

and we put:

Prompt = normal

and finally run

sudo do-release-upgrade

In a server edition is interesting to follow this process, which is supposed to depend on the services and should not have to interrupt. Updating minimize the time that these services will be held.