lshw -C display shows UNCLAIMED for GT840M graphics card

I've tried everyway to install drivers for NVIDIA and get it working but my laptop still insist on using Intel Haswell integrated GPU.

Here's a what I've tried so far:

First I've tried to install latest drivers from graphics-driers PPA:

sudo apt-add-repository ppa:graphics-drivers/ppa
sudo apt-get update
sudo apt-get install nvidia-367 

I was hoping that it could get my graphics card to work but it didn't.

Then I downloaded .run file from offical nVidia website but this installer gives me "The distribution-provided pre-install script failed!" error. Still don't know why it gives me such error.

Last thing I tried was after installing nvidia-367:

sudo apt-get install nvidia-prime
sudo prime-select nvidia
reboot

As you can guess, it didn't work either. sudo lshw -C display command gives me following output:

  *-display               
       description: VGA compatible controller
       product: Haswell-ULT Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 0b
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:43 memory:b5000000-b53fffff memory:c0000000-cfffffff ioport:6000(size=64)
  *-display UNCLAIMED
       description: 3D controller
       product: GM108M [GeForce 840M]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:0a:00.0
       version: a2
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:b3000000-b3ffffff memory:a0000000-afffffff memory:b0000000-b1ffffff ioport:3000(size=128)

I'm using Ubuntu 16.04 and my graphics card is nVidia GT 840M

Secure Boot does not let the nvidia module load.

Disable Secure boot in BIOS and it should be solved.

You can see this question for more information.

display UNCLAIMED can also mean a hardware problem. Especially if the problems started without any software updates.