Ubuntu Guide shows you how to enable Nautilus Preview in Ubuntu 13.10 / 14.04
This tutorial is going to show you how to enable Nautilus preview feature in Ubuntu so that you can quickly preview musics, pictures, movies and documents in file browser by tapping the Space key.Enable Nautilus Preview in Ubuntu 13.10 / 14.04
There's a Nautilus add-on called gnome-sushi. It's similar to Gloobus Preview that provides quick file previews. gnome-sushi is available in Ubuntu Software Center since Ubuntu 12.04 Precise.