Help! I broke Ubuntu by disabling alt-key mouse modifier

Nevermind. Problem solved. I figured it out on my own. Switching the modifier to super key solved the issue. There’s also a none-command line method of changing the key. Much less scary.

I followed instructions to configure the Alt+Mouse conflict in Linux for Ubuntu 12.4 as detailed here: I copy pasted the command exactly into the terminal in Ubuntu but now I can’t click anything without using the Alt key (right or left click). How do I fix it? What’d I do wrong?