I've been upgrading Ubuntu installations quite a few times recently, and thought it makes sense to post a really short how-to if you ever want to upgrade your Ubuntu distro from the command line.
Use apt-get to upgrade Ubuntu
The procedure for upgrading one Ubuntu release to another one is pretty straightforward. There are some rules though:
- Never attempt to skip a release or two when upgrading
- Never do a few Ubuntu release upgrades in a row without reboots in between
- Always backup the files you change
- Always have an install CD for your current Ubuntu release around