Here's how you can enable the hibernate option in Ubuntu 13.04.
1. Open a terminal window.
2. Type in the following command then hit Enter.
sudo gedit /var/lib/polkit-1/localauthority/50-local.d/hibernate.pkla
3. Paste in this code into the file: [Re-enable Hibernate] Identity=unix-user:* Action=org.freedesktop.upower.hibernate ResultActive=yes
4. Save your file.
5. Shut down your Ubuntu 13.04 system.
6. Restart your computer.
For more, see the original article at the link below.
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