I recently bought a Dell Inspiron 3521 laptop. It came with a 12.04 ubuntu installation. I really don't like unity, so I set up Xubuntu 12.04 with my existing iso. But after a few days i realized my OS is 32bit and laptop is 64bit. And there were some stability problems. Then I decided to go back to original system and install xubuntu-desktop on it. I did exactly like this. Now almost everything is ok, but hibernate is not working. In 32bit xubuntu installation it was working, but now is not. My system is completely up to date. I've been searching for a few days, but couldn't find something useful/working. Is anybody can help me? Thanks a lot.