I've add this following code to
/etc/polkit-1/localauthority/50-local.d/com.ubuntu.desktop.pkla
[Enable hibernate by default]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes
When i choose to hibernate, the pc doesn't shutdown but i can see the text in the image in the link...

Help me please..I need to hibernate my computer.. Thanks