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
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.