Upgrade Ubuntu distribution without graphical interface

I've just installed a base Ubuntu machine now, JEOS, really great thing when setting up a system in VMware. But anyway, what I thought of right now is how simple it was to update to next dist! I installed jeos-8.04-1 which was a Hardy dist which is a bit old. So I made a try to upgrade it. So here is a short list of the steps I took. (As root)

1. apt-get update && apt-get upgrade
2. apt-get install joe (just to have a nice editor)
3. Open and edit /etc/apt/sources.list
4. Replace all hardy with intrepid everywhere
5. apt-get update && apt-get dist-upgrade
6. reboot

Then do the same thing if you want to upgrade to jaunty! Parhaps it works jumping right into jaunty, but I took it step by step.

Check this if you have a graphical interface:
how-to-upgrade-ubuntu-710-to-ubuntu-804