So I tried to install the graphics drivers for my nvidia geforce gt540m on ubuntu 13.04 64 bit. I tried following the instructions here: http://ubuntuforums.org/showthread.php?t=1916961 but it didn't work right and now the only desktop environment I can boot into is gnome fallback. (I have unity and cinnamon installed as well.) in unity metacity doesn't work anymore and in cinnamon it crashes and goes to fallback. I just want to get my system back to the way that it was and I was going to follow the following instructions to install the nvidia drivers : https://wiki.ubuntu.com/Bumblebee#Installation
Please advise how to fix my current problem and also if I should follow the instructions provided in the link or a different set of instructions. thanks in advance.