I have had bumblebee working since 13.04. It took me some messing around though and now on 14.04 it is not working anymore.
How can I purge it completely and reinstall it?
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To remove bumblebee completely
sudo apt-get install ppa-purge sudo ppa-purge ppa:bumblebee/stable sudo apt-get purge bumblebee
To reinstall bumblebee (and bumblebee ui) follow this How to set up nVidia Optimus/Bumblebee in 14.04
I recommend looking into installing the proprietary drivers and nvidia-prime if you are using 14.04. It finally supports optimus and you can switch your graphics card via an additional indicator. For me the performance is much better using nvidia-prime. In this thread the installation is explained quite well: How do I get switchable graphics to work on my Samsung RF711 With Intel HD & GeForce 540M Graphics cards on Ubuntu 14.04 LTS