1) First off make sure your swap partition is bigger than your RAM otherwise you wont have enough space to save the contents of your memory. Use gparted or whatever takes your fancy. Plenty of help on the net for this so I won't go into it.
2) Hibernation was removed from Ubuntu so you need to get it back into you shutdown menu again:
Open:
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sudo nano /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla
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