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35a32c5
(Get the code!)
@Jérôme, Regardless of how you go about it, you'd need to enter a complex passphrase each time you start your computer, whether it's a cold boot or after hibernation.
To give a comparison, imagine if Windows introduced a security feature requiring every user to enter a complex passphrase when turning on the computer; furthermore, every user on a single computer would need to know the same shared passphrase (in addition to their own login password). There would be a worldwide revolt.
Ubuntu would have the very same restrictions.
That's why hibernation cannot reasonably be available by default; the majority of Ubuntu users are not technically expert, but rather are "everyday" users and would revolt against this.
Full-disk encryption is available via LUKS (now an option during installation in 13.10) for those who have the need, and hibernation can work then; perhaps it should be available by default, but only when LUKS is being used.