[SOLVED] NVIDIA - "Can't access Secondary GPU" with Bumblebee in Ubuntu 14.04 LTS

I recently installed Ubuntu 14.04 GNOME Beta1 on my Asus K55VM laptop with NVIDIA GeForce 630M graphics. Like the previous release (Ubuntu 13.10), the LTS version beta1 release also ships with nouveau drivers for NVIDIA. Now I encountered problems of laptop overheating as the hybrid graphics are always on, which I don't require.

Hence, the best option for me was to install bumblebee. I ran the