Fixing Ubuntu stall at login after bad CUDA installation

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Sometimes installing CUDA on Ubuntu turns out to be a huge broom in the ass.

One of the most common issue is that once you login after rebooting Ubuntu
is stalled.

To fix this problem, it is necessary to go on one TTY (e.g. Ctrl+Alt+F1),
login with username (with administrator rights) and password and try one of
the following procedures.

Trial #2 worked with me, in the sense that I could normally login in Ubuntu,
but I was still at the starting point....no damn CUDA....grrr...


Trial 1:

$ sudo su
$ apt-get update
$ apt-get install --reinstall ubuntu-desktop
$ apt-get install unity
$ reboot

Trial 2:
$ sudo su 
$ apt-get update
$ apt-get install --reinstall ubuntu-desktop
$ apt-get install unity
$ apt-get remove --purge nvidia*
$ reboot

Trial 3:
$ sudo apt-get install nvidia-current
$ sudo reboot

Trial 4:
$ sudo apt-get remove --purge nvidia-* 

Second, download & Install Nvidia Driver 331.38 (you may want new version)

For 32 bit (x86):
$ cd && wget us.download.nvidia.com/XFree86/Linux-x86/331.38/NVIDIA-Linux-x86-331.38.run

For 64 bit (x86_64):
$ cd && wget us.download.nvidia.com/XFree86/Linux-x86_64/331.38/NVIDIA-Linux-x86_64-331.38.run

And then,
$ chmod +x NVIDIA-Linux-*-331.38.run $ sudo sh NVIDIA-Linux-*-331.38.run $ sudo reboot

These procedures have been described on [Jiakai Zhang's blog](http://jiakaizhang.com/fix-frozen-after-login-in-ubuntu-14-04/)