Enabling Hibernate in Ubuntu/Kubuntu

This.

The relevant bits duplicated below:

To re-enable hibernate, run below command to edit the config file:

sudo <YOUR EDITOR> /var/lib/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla

Copy and paste below lines into the file and save it.

[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

I also removed the similar lines for Disabling hibernate