Newbie updated to 13.04 and linux-headers-3.8.0-18: now unity won't start.

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http://ubuntuforums.org – Hello everyone, I've installed Ubuntu on my laptop last Friday. After I was done with setting up my stuff, I tried to install the ATI proprietary drivers (I am running on a 6990M) since I was using them on Crunchbang. I had some issues at first, like booting into a black desktop with no unity/compiz functionalities but uninstalling fglrx (if I had used apt to install the drivers) or running the ati uninstall script was enough to revert back to the open drivers. I finally managed to install the proprietary drivers by first installing the linux-headers package. On Sunday I decided I wanted to in (Hardware)