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.
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.
To install gnome-sushi, search for and install the package from Ubuntu Software Center. Then restart Nautilus by running command
nautilus -q to make this add-on work.
After that, you can select a file in Nautilus and press SPACE key to preview and press the key again to quit preview.