I have a AMD laptop, not to mention that upgrading screwed bootup, I had to do a safe mode and uninstall nvidia drivers and install ati drivers. Finally got it up :), and was hit by slow, really slow ui. Researched a bit and found the following steps to install 2d, now works like a charm, SUPER FAST. This is the real ubuntu man..
sudo add-apt-repository ppa:unity-2d-team/unity-2d-daily
sudo apt-get update
sudo apt-get install unity-2d
select unity-2d as your desktop