Ubuntu 13.04 is out. But sommes features gone out with this release. For example, when you press a letter, it launch an index search or tree representation of your folder was disappear in side bar.

Fortunately, there is exists an old version patched by SolusOS to find old habits again.

To do that you can install this version with following lines.

sudo add-apt-repository ppa:webupd8team/experiments

sudo apt-get update
sudo apt-get dist-upgrade
killall nautilus

source : http://www.webupd8.org/2013/04/get-nautilus-34-features-back-in-ubuntu.html