How do I use Awesome WM with Ubuntu 12.04? How do I invoke Awesome instead of Unity? Any dangers to trying to install it - in other words can I mess up my graphical shell?
There should be no problem installing it as
lightdm controls what environment you log in to. After installing it, log out and click to the right of your name and awesome will be listed there.
Note: recent version of ubuntu (13.10) comes with a bug preventing the awesome session from displaying. See how to add awesome on session list for further detail.