1) Open the terminal (Ctrl+alt+T) 2) type: sudo gedit /var/lib/polkit-1/localauthority/10-vend or.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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