Hibernate worked fine for my system in previous 10.10 and 11.04 versions. I recently upgraded to 12.04. I did not see any hibernate command in the menu.
I made the change proposed in another Ask Ubuntu question. I tested hibernate using the
pm-hibernate command but my system seemed to "hibernate temporarily" and then do an immediate restart! The same behavior is experienced after implementing the How to enable hibernation? guidelines. Do you know how can I fix that?