No login screen after boot screen on installaion of NVIDIA drivers

Question

I have an NVIDIA 820M graphic adapter for which I tried installing nvidia-352 drivers. prime-select query keeps showing unknown and I cannot switch my drivers as it says that alternatives are not set up properly. I referred this link to set the alternatives and was successfully able to switch but as soon as I reboot the system I do not get my login screen but a black screen after boot screen.

For some reason System Settings -> Software & Updates -> Additional Drivers only displays nvidia-340 on my laptop even after update. So I tried installing nvidia 340 as well and the results were same as described above.

Answer 1

Install the NVIDIA drivers and NVIDIA Optimus (PRIME) in a different way :

1. Remove all NVIDIA software you tried to install before.

Highlight the Ubuntu menu entry and press the E key.
Add nouveau.modeset=0 to the end of the linux line.
Press the F10 key to boot into the Ubuntu system.

When the login screen appears press Ctrl+Alt+F1.
Enter your user name and password ... then execute :

sudo apt-get purge nvidia*
sudo reboot

2. Install NVIDIA drivers 352 from the Ubuntu repositories.

Highlight the Ubuntu menu entry and press the E key.
Add nouveau.modeset=0 to the end of the linux line.
Press the F10 key to boot into the Ubuntu system.

When the login screen appears press Ctrl+Alt+F1.
Enter your user name and password ... then execute :

sudo apt-get update
sudo apt-get install nvidia-352 nvidia-prime
sudo reboot  

Update addressing your feedback that it still doesn't work with drivers 352 :

1. Remove the currently installed NVIDIA 352 drivers.

Highlight the Ubuntu menu entry and press the E key.
Add nouveau.modeset=0 to the end of the linux line.
Press the F10 key to boot into the Ubuntu system.

When the login screen appears press Ctrl+Alt+F1.
Enter your user name and password ... then execute :

sudo apt-get purge nvidia*  
sudo reboot 

2. Install the latest official stable NVIDIA 361 drivers.

Highlight the Ubuntu menu entry and press the E key.
Add nouveau.modeset=0 to the end of the linux line.
Press the F10 key to boot into the Ubuntu system.

When the login screen appears press Ctrl+Alt+F1.
Enter your user name and password ... then execute :

sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
sudo apt-get install nvidia-361 nvidia-prime
sudo reboot