Upgrading Ubuntu 5.04 to 5.10 (in, increasingly inaccurately named, 3 easy steps)

All you have to do to upgrade Ubuntu 5.04 (Hoary Hedgehog) to 5.10 (Breezy Badger) is:

1. Start Synaptic Package Manager.
2. Go to Settings / Repositories.
3. Change Distribution from hoary to breezy for every Ubuntu repository (example).
4. Close the Repositories window; the package information will be automatically reloaded.
5. Press Mark All Upgrades button and choose Smart Update.

That's all - Synaptic Package Manager will download all the needed packages and install them.