Ubuntu 14.04 boots to black screen after installing drivers on Geforce GTX 960m

Here are the steps I did on my Dell Inspiron 7559 laptop:

  1. Ctrl+Alt+F1
  2. 'sudo service lightdm stop'
  3. 'sh ./NVIDIA-Linux-x86_64-367.27.run'
  4. 'sudo nvidia-xconfig'
  5. Added a line 'BusID PCI:2:0:0' to the Device Section of '/ect/X11/xorg.conf'
  6. 'sudo service lightdm start'

I did not find any errors in Xorg.0.log. Can someone help solving this issue?

Attached is the file generated by running

sudo nvidia-bug-report.sh

after I did

sudo service lightdm stop
startx -- -logverbose 6


Why are the attachments taking forever to be scanned?
nvidia-bug-report.log.gz (146 KB)
nvidia-installer.log (24.4 KB)