Add NVIDIA driver post

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+---
+title: Getting Login to Work on Ubuntu 15.04 with NVIDIA Drivers
+description: When I upgraded to Ubuntu 15.04, logging in broke. Here's how I fixed it.
+layout: post
+date: 2015-04-23 00:00:00
+---
+
+When I upgraded to Ubuntu 15.04, I was unable to log in. The machine started normally and I was presented with the login window. But when I entered my password, the screen went black for a few moments and then the login screen came back.
+
+Since I'm using an [NVIDIA GeForce GTX 750](http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-750), which Ubuntu's Nouveau drivers don't support, I previously needed to install the NVIDIA graphics drivers.
+
+By entering <kbd>Ctrl</kbd> + <kbd>Alt</kbd> + <kbd>F3</kbd>, I was able to drop to a shell. When I checked `/var/log/Xorg.0.log`, I found a message stating that the NVIDIA driver had failed to load the GLX module, despite earlier messages that it had been loaded. The message also recommended reinstalling the NVIDIA driver.
+
+In the same shell, I ran:
+
+```
+$ wget http://us.download.nvidia.com/XFree86/\
+  Linux-x86_64/349.16/NVIDIA-Linux-x86_64-349.16.run
+$ chmod u+x NVIDIA-Linux-x86_64-349.16.run
+$ sudo service lightdm stop
+$ sudo ./NVIDIA-Linux-x86_64-349.16.run
+```
+
+After that, restarting my computer cleared up the issue.