Installing is not as simple as you might wish, but it isn't too hard either. On the Beryl wiki there's an entry on how to install Beryl on Ubuntu and you can basically follow that.
The only notes I have on the installations steps are:
I had an error message while starting Beryl. As a consequence I had no window manager! The message was:
beryl: No GLXFBConfig for depth 32
After doing some searches on the web I found a post that gave a solution to this problem. Just add the following to "Device" section on your
Option "AddARGBGLXVisuals" "True"
Option "DisableGLXRootClipping" "True"
Also I skipped the entire "Configuring Beryl" section and just added
beryl-managerto my Startup Programs in System > Preferences > Sessions
Next you have to configure Beryl. There's a ton of options, animations, keyboard shortcuts, themes, etc, etc that you can tweak with to make your desktop look exactly like you want it to! And if you have a bit of patience and 28Mb of spare memory to run Beryl, it's really worth the trouble.