Ubuntu 12.04 doesn't have enabled hibernate feature by default, but you can enable it if your hardware has support for hibernation.
Before you turn on the hibernate option in Ubuntu 12.04 Precise Pangolin you need to be sure that you machine supports hibernate without any issues. Please consider that hibernate feature on unsupported devices could make a lot of problems even losing your data. You're warned!
By default Ubuntu 12.04 doesn't have enabled options to show desktop except using shortcut keys Ctrl + Super + D. The "Super" button is actually the Windows button.
However, there are several ways to enable show desktop in Ubuntu 12.04 and we're going to mention the most used.
Ubuntu 12.04 contains error reporting system named Apport that can send error information to Ubuntu center in case that something goes wrong on your system. Debugging program crashes without any automated tools has been pretty time consuming and hard for both developers and users, so that is the main reason why this system exists.
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Many Linux users that have netbooks have been complaining about restart issue. I didn't pay attention to the complaints until I bought Acer Aspire One D257 netbook
Namely, the netbook running Ubuntu 11.10 and Ubuntu 12.04 failed to reboot, it ended up in a black screen and can only shutdown. What was very strange the issue existed only on regular restart procedure: System button in upper right corner > Shut down... > Restart button. If restart was peformed after system udpate it could reboot properly.