Upgrading is easy, basically just edit the file /etc/apt/sources.list, replace every reference to ‘etch’ with ‘lenny’, and run the normal apt-get update and apt-get dist-upgrade. This will download a whole bunch of files and start the seamless upgrade. Get some coffee and get ready to answer quite a number of questions on whether or not you wish to keep your own config files or replace them with the package maintainer’s (depending on the amount of packages you run and how much you edited the original config files).

So far every system I ran the upgrade on came up beautifully after the reboot following the upgrade, no glitches or bumps anywhere. Yummie.