When your ubuntu desktop is suddenly go crazy, probably because you do something with compiz, and the result is you can't click on anything, your desktop is disappear.
The only thing you can do is pop-up a terminal window and that's it! so how to run/open compiz config manager thing from command line?
You have try typing 'compiz' but it won't work, yeah it's because that's not the right command for running compiz config manager, the correct one is this:
That's the correct command for calling the compiz config manager thing, now you can do whatever you need to do with it.