Boot to black screen

[makitso]

Ubuntu Gnome, 14.04.1 latest update.

On boot, system hangs (black screen) after ubuntu gnome splash and before the login prompt.

The problem appears to be today's update to xserver-xorg-core:amd64.

[makitso]

Problem fixed by upgrading to Nvidia 340 driver

[EuclideanCoffee]

Problem fixed by upgrading to Nvidia 340 driver

I have this error sometimes. How did you upgrade with a black screen? :?:

[makitso]

I used a ppa to get the new drivers. See this link.
http://www.binarytides.com/install-nvidia-drivers-ubuntu-14-04/