I recently bought a GTX 750Ti which isn’t supported by Ubuntu’s drivers yet. So I installed the drivers from Nvidia itself. They work great, the card is very quiet and operates without getting hot at all. One problem: after running an Ubuntu update that updates your kernel it won’t work anymore.

sudo su
cd /usr/src
ls

Examine the output:
My nvidia driver src location: /usr/src/nvidia-334.21

dkms build -m nvidia -v 334.21
dkms install -m nvidia -v 334.21

If the commands fail on missing linux headers, install them:

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

Now you have 2 options: Reboot or do a modprobe nvidia and restart X

Enjoy fancy Nvidia graphics again