Ubuntu Guide shows you how to install Kernel 3.5 RC on Ubuntu 12.04 Precise using PPA
This tutorial will explain how to install Linux kernel 3.5 rc release using ppa. First open a terminal from the dash home(or press Ctrl+Alt+T), add the ppa

org-edgers/ppa by command: sudo add-apt-repository ppa

org-edgers/ppa Then do update and dist-upgrade.