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 🙂