Hi guys! I've made this tutorial cuz my Driver Manager wasn't working well, hope it helps:


   1 Obviously starting with an update and upgrade:
  
        sudo apt-get update && sudo apt-get upgrade

   2  Then remove all Nvidia packages, skip this if your OS is fresh installed:

        sudo apt-get remove nvidia* && sudo apt autoremove

   3  Install some packages for build the kernel:

        sudo apt-get install dkms build-essential linux-headers-$(uname -r)

   4  Now block and disable Nouveau kernel driver:

        sudo pluma /etc/modprobe.d/blacklist.conf

   5  Insert the following lines to the blacklist.conf:

blacklist nouveau
blacklist lbm-nouveau
options nouveau modeset=0
alias nouveau off
alias lbm-nouveau off

   6  Save and exit.

   7  Disable the Nouveau kernel by typing the following commands(nouveau-kms.conf may not exist, it is ok):

        echo options nouveau modeset=0 | sudo tee -a /etc/modprobe.d/nouveau-kms.conf

   8  Build the new kernel:

        sudo update-initramfs -u

   9  Reboot.

   10  After the reboot you need to exit the X Server, for that we need to stop LightDM, press Ctrl+Alt+F1 in the logging screen, log in with your user and password, after that:

        sudo service lightdm stop

   11 Now install your Nvidia driver:

        sudo apt-get install nvidia-VERSION

   12 Reboot.

This worked for me, I have a HP G60-125NR AMD Turion X2 64bits with a Nvidia 8200M G. This tutorial may not work if you need to install "bumblebee" too, I don't know how to configure it cuz I don't need it, you will have to read somewhere else about that.

Sorry for my bad english!