For historical reasons, I have been installing my Ubuntu laptop on a fully encrypted disk for years. Up until now, I needed to use the alternate CD since this was the only possibility to install with full disk encryption.
This is no longer the case. If you want to use full disk encryption with Quantal Quetzal, you can use the standard installation CD and will be presented with the following options :
You can then select the « Encrypt the new Ubuntu installation for security » option to request full disk encryption. Alternatively, you can elect to use LVM as I did, but this is not a requirement in order to get full disk encryption.
Kudos to the Ubuntu development team for making this option so simple now !