I recently decided I would prefer to have the option of using hibernate on my laptop running Ubuntu 12.04 LTS. Not only does hibernate need to be enabled manually on any system running that OS; I also had insufficient swap space, so I had to resize my partitions.
Now hibernate would work, but resume would not! It turns out the reason is that I elected to encrypt my $HOME folder during installation. This requires encrypted swap; when you reboot, the swap is encrypted with a fresh, random key each time.
By insisting on using the same key each time, which requires you to enter a password during boot, you enable the boot system to detect and reload the hibernate image. If you forget the password, you boot with no swap partition.
Detailed instructions are here. It worked for me!
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