[ubuntu] Full disk/home directory encryption

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http://ubuntuforums.org – I'm installing Ubuntu using the alternate installation CD. I would like to do full disk encryption, and I have two questions: 1. Is the following option the correct one for Full Disk Encryption with pre-boot authentication? Code: Partitioning method: Guided - use entire disk and set up encrypted LVM 2. If you select that option, it still gives you the option to encrypt the home directory later on. But if you already have have an encrypted LVM, does that add anything security wise, right? Can I just skip that? (Hardware)