For previous Ubuntu versions, I had used the Alternate CD .iso image installer in order to get disk encryption for my laptop. As Marius Nestor correctly points out, there’s no Alternate CD with 12.10 – this feature is now wrapped in the main installer. I discovered all this after my first install using the “Something else” option shown Marius’ post, which didn’t offer the disk encryption option (or perhaps I missed it).
There’s no GUI method of turning off “Guest Session” login, but it can be easily done in config.
The launcher is much improved and rearranging icons is finally a user-friendly experience.
I don’t like advertised content in the Dash. I’m betting the community will shout that idea down. But in the meantime, I think I saw a way to turn them off along with Twitter/Facebook/Gmail/etc. integrations.
Overall, my early-2008 vintage ZaReason 2GB BigLap had been ready for a fresh install. Now it’s running 12.10 just fine, thank you very much. It’s a worthy upgrade.