Comment 4 for bug 1268217

There is no need to remove nvidia-prime to install bumblebee. I installed bumblebee here in trusty, and I disabled nvidia card in the Nvidia Settings, so now it uses Intel card all the time, and primusrun & optirun runs normally Nvidia card (you have to configure /etc/bumblebee/bumblebee.conf and add bumblebee in your user, as well).

Tested with nvidia-331-updates (331.38) and linux 3.15-rc7 from canonical mainline.