Did you check the Ubuntu community support documentation regarding LVM - Logical Volume Manager & Cryptsetup utilizing LUKS & Grub2 auth with AES256?
https://help.ubuntu.com/community/EncryptedFilesystemLVMHowto
You might want to read those before you shell out (pun) for PGP WDE.
I recollect that on 10:10 Meerkat DVD you can select LVM - Encrypted /root /home /swap setup from the installer before you opt to install and input a passphrase.
Then you have to hand edit the grub2 startup file and tell it to use AES on your grub2 password, this way no one can hot-boot your linux and use the recovery console without providing a password to the grub boot manager.
Whole Disk Encryption or Secure File System is already supported in Linux without the need to use PGP.
But I digress I am probably not winning any friends over at symantic by informing you about it.
Would you prefer - PGP - Pretty Good Privacy or MGP - Military Grade Privacy - Security Enhanced Linux with a LUKS mountable file system.
Not so easy on Ubuntu as they dont support the SELinux Kernel. But kind of a no brainer ;)