Like to use the suspend/Hibernate function of Ubuntu, which saves me time from Bootup.
It find this is in gnome flashback(Metachity) session.only. Would like to try other Gnome new desktop session, but didn't switch to, due to lacking of the hibernate button.
Googled and finally find it is there, just need to press ALT button, and the power off icon becomes PAUSE icon, which means suspend/Hibernate.
Later on, I also find my favorite taskbar / panel by configure it with gnome-tweak-tool
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