Earlier today I upgraded from Ubuntu Server 6.10 to 7.04 from the command line in just a few simple steps:

Make sure we have the latest updates

Check for updates:

sudo apt-get update

Install any updates:

sudo apt-get upgrade

Now prepare to upgrade to 7.04

Install the latest upgrade manager:

sudo apt-get install update-manager-core

Run the upgrade tool for servers:

sudo do-release-upgrade

And everything went smoothly. The only issue I had, was that I had to install inetd again to get SWAT working (sudo apt-get install netkit-inetd). Everytime I use Ubuntu I fall more and more in love with it 🙂