Network Upgrade for Ubuntu Server From 8.10 to 9.04

How do I upgrade Ubuntu Linux server 8.10 to 9.04 remotely over ssh session?

Be sure that you have all updates applied to Ubuntu 8.10 server before you upgrade. Type the following command to apply updates:
$ sudo apt-get update
$ sudo apt-get upgrade

WARNING! Backup important data, sql and configuration file before server running the following upgrade commands. The following discussion only applies to the SERVER edition. For Ubuntu 9.04 desktop upgrade see this FAQ.

Next, install update-manager-core if it is not already installed:
$ sudo apt-get install update-manager-core
Finally, start the upgrade tool, enter:
$ sudo do-release-upgrade
Now, just follow the on-screen instructions to upgrade your server over ssh session.