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How to Re-enable Hibernation in Ubuntu 14.04

1) Open the terminal (Ctrl+alt+T)

2) type: sudo gedit /var/lib/polkit-1/localauthority/10-vend­or.d/com.ubuntu.desktop.pkla

3) Enter your password when requested.

4) Search for the section 
[Disable hibernate by default in upower]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=no


[Disable hibernate by default in logind]
Identity=unix-user:*
Action=org.freedesktop.login1.hibernate
ResultActive=no

5) Change both value of "ResultActive=no" to "ResultActive=yes"

6) Save and close the editor.

7) Log out and then log back in, or reboot the system. You are now good to go!
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