I installed a fresh Ubuntu 13.04. In 12.10 I enabled Hibernation and it works nicely. Because I'm using for 7 or 8 hours my laptop a day, I use Hibernation a lot. But in 13.04 after hibernating my system, when It wants to start from hibernation it crashes and I have to restart my system. What should I do ? I think I confront with some graphic driver errors in a black screen.