If you are installing ubuntu, you can setup Full Disk Encryption via an encrypted LVM as your root partition almost effortlessly. You just need to download the alternate disk rather than the normal live disk.
Example download file For 9.10 64bit:
http://ftp.ucsb.edu/pub/mirrors/linux/ubuntu/9.10/ubuntu-9.10-alternate-amd64.iso.torrent
When booted This disk will go into the old TUI style installer interface rather than booting a live Ubuntu session, however during the partitioning stage of the install there is an option available for a guided install using an encrypted LVM setup. After select and confirming that option, it will then prompt for a password... make it a good one, and one that you'll remember.
Using this method it is virtually impossible to boot into the operating system or read anything on the disk without knowing the password that you set, and attempting to crack the encryption would be a monumental and expensive effort.
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