I just installed the nvidia drivers for my gpu following this guide. After the reboot i quickly see tty1 login but then the screen goes black with a flashing underscore (_) and I can't do anything.

Im running Ubuntu 15.10

  • Did you install from homepage nvidia or via terminal?
    – BeGood
    Nov 22, 2015 at 21:26
  • I installed it from the terminal
    – Zodox
    Nov 22, 2015 at 21:26
  • askubuntu.com/a/696662/413306 hope this help you
    – BeGood
    Nov 22, 2015 at 21:28
  • for future reference, you can install the nvidia drivers through apt-get, there really is no reason to install from source, especially on 15.10
    – mchid
    Nov 22, 2015 at 21:43

2 Answers 2


1.Remove a particular X11 config file. This file is not really required.

rm /etc/X11/xorg.conf.failsafe

Somehow, the existence of the above X11 configuration file causes the OS to throw that error.

2.Restart lightdm GUI server.

service lightdm restart

This will restart the lightdm GUI server and voila your desktop is back!


I did this night before last with 15.04. I followed these instructions: http://www.allaboutlinux.eu/remove-nouveau-and-install-nvidia-driver-in-ubuntu-15-04/

Specifically notice the bit about the extra build packages and disabling the nouveau driver.

To recover from where you are you can:
1) boot into recovery root shell and mount -o remount,rw / to be able to make changes.
2) Then do a NVIDIA-Linux-xxx-xxx.xx.run --uninstall and reboot which should get you back to a workable state.

  • the OP did not use apt-get but installed from source instead so this will not work
    – mchid
    Nov 22, 2015 at 21:42
  • Thanks I have updated my answer to show how to unisntall from the package that you get from nvidia. I was coming from the propritary flgrx driver so it was apt-get remove for my case from two nights ago.
    – Eddie Dunn
    Nov 22, 2015 at 21:52

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