I have updated the documentation for Manual Full System Encryption, and vastly simplified it in the process.
For those who don't know, this allows you to encrypt everything including /boot, excluding the EFI System Partition for obvious reasons, and it plays nicely with other systems, e.g. Windows.
If you choose to try it, please let me know (in this thread) if it works for you and if you find any bugs in the documentation or the process.
Whether or not it works, it would be helpful to know which flavour and version you use.
Please read the warnings and caveats before deciding whether or not to use it. Ignoring them could leave you disappointed.
If you like it, and want Canonical to officially implement it or something like it in the Installer, please support the request (log in and select the green writing at the top left).
Thank you
EDIT: Jernej Jakob has created instructions to convert an unencrypted installation to an encrypted one. I have not tested it, but Jernej says that it works on Ubuntu.
EDIT: Tj has created an alternative how-to that might supersede this method (I haven't tested it, but it looks good).
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