I have tried alot of different ways to get my pc working with graphics card but hasnt got me anywhere.
I started off with installing ubuntu 12.04 for the first time which left me stuck at black login screen. (solved now).

I have tried bubmlebee method and installing driver from Nvidia directly but both didnt work. (I’ve got removed Nvidia* now since it didnt work)
with bumblebee I could not run optirun or prium

lspci -nn | grep -i vga

00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06)

sudo lshw -C display

*-display UNCLAIMED     

       description: 3D controller

       product: GK106M [GeForce GTX 765M]

       vendor: NVIDIA Corporation

       physical id: 0

       bus info: pci@0000:01:00.0

       version: a1

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list

       configuration: latency=0

       resources: memory:f6000000-f6ffffff memory:e0000000-efffffff memory:f0000000-f1ffffff ioport:e000(size=128) memory:f7000000-f707ffff

  *-display

       description: VGA compatible controller

       product: 4th Gen Core Processor Integrated Graphics Controller

       vendor: Intel Corporation

       physical id: 2

       bus info: pci@0000:00:02.0

       version: 06

       width: 64 bits

       clock: 33MHz

       capabilities: msi pm vga_controller bus_master cap_list rom

       configuration: driver=i915 latency=0

       resources: irq:45 memory:f7400000-f77fffff memory:d0000000-dfffffff ioport:f000(size=64)

lspci | grep NVIDIA

01:00.0 3D controller: NVIDIA Corporation GK106M [GeForce GTX 765M] (rev a1)

PS: I used http://followthegeeks.com/a-noobs-guide-to-installing-nvidia-optimus-driver-in-ubuntu/ to solve black screen problem.