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Upgrading Ubuntu Machines

Is Ubuntu great or what? Two commands, then leave the machine alone for a while, lo and behold, you've got an upgraded Ubuntu machine to the newest status!

ashant@feather:~$ sudo apt-get install update-manager-core
ashant@feather:~ do-release-upgrade

é finito!

I've tried this on my Dell Latitude D620 Ubuntu, from 7.04 to 8.04 (LTS - long term support). Next in line is my Kubuntu Latitude X300, which I plan to do tonight (as it could take over 3 hours).