Turn On Hibernate On Ubuntu 13.10

First, open the terminal

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

Paste the following and save the file.

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

[Re-enable hibernate by default in logind]
Identity=unix-user:*
Action=org.freedesktop.login1.hibernate
ResultActive=yes

Restart the machine. Then run sudo killall indicator-session-service once 

you've entered a new session, and then you'll have your hibernate functionality back.