apt - Replacing Nouveau driver with Nvidia driver

I am running a fresh install of Lubuntu 14.04, and I want to use Nvidia drivers rather than the default Nouveau drivers.

So, as advised here (http://www.binarytides.com/install-nvidia-drivers-ubuntu-14-04/), I enter the following commands:

sudo add-apt-repository ppa:xorg-edgers/ppa -y
sudo apt-get install nvidia-current

This appears to run fine. However, if I check the installation by entering:

lspci -vnn | grep -i VGA -A 12

Then I get the output:

Kernel driver in use: nouveau

So it seems that the Nouveau driver is still being run, rather than the Nvidia driver. How do I enable the Nvidia driver?