Enable Hibernation on Ubuntu 12.10

1. Testing if hibernate work in your computer by type this command below

$ sudo pm-hibernate

2. If it work try command below

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

3. Add this content to your file

[Re-enable hibernate by default]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes

4. save it and close and reboot your computer


credit : http://nikunjlahoti.com/2012/10/31/enable-hibernation-on-ubuntu-12-10/