Hibernation is disabled on Ubuntu 12.04 and Mint 13 by default - you can only access it with the command line. To have it as an option in the shutdown menu again, open a terminal and enter the following:

sudo gedit /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla

By that you create a new text file. Paste the following into it:

[Enable hibernation]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes

Save the file afterwards and reboot. Hibernation should now be an option in the shutdown menu again.

How to enable hibernation in Ubuntu 12.04 and Linux Mint 13
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