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I just tried updating from CUDA-5.0 to CUDA-6.5 and seem to have broken my GUI interface. I tried to update with the following procedure:

sudo dpkg -i cuda-repo-ubuntu1404_6.5-14_amd64.deb 
sudo apt-get update
sudo apt-get install cuda

I then updated my PATH and LD_LIBRARY_PATH environment variables so that they contained paths to /usr/local/cuda-6.5.

However, when I reboot my machine, the resolution of the logon screen is wrong - everything is slightly too large, and after I logon, all I get is the background screen. I have no access to icons or menus, although my touchpad still works and I can move a pointer around the screen.

When I switch to one of my virtual terminals, I can verify that:

  1. lspci still shows my NVIDIA GeForce GTX 670MX
  2. /usr/bin/cuda-6.5 is installed
  3. nvcc -V shows 'Cuda compilation tools, release 6.5, V6.5.12'

But, cat /proc/driver/nvidia/version claims there is no such file or directory. Also, I don't even have the /proc/driver/nvidia directory.

I think that I somehow removed my nvidia drivers, even though I still get some graphics for the logon screen.

Does anyone know how I can fix things or what other debugging steps I should try, so that I can use my GUI interface again?

Thanks...

PS

I just tried to install the nvidia-340 driver by:

  1. sudo add-apt-repository ppa:xorg-edgers/ppa
  2. sudo apt-get update
  3. sudo apt-get install nvidia-340

It seems to claim that nvidia-340 is installed 

 nvidia-340 is already the newest version. 
 nvidia-340 set to manually installed

but there's still no /proc/driver/nvidia directory... Am I missing something obvious?

Thanks

Tshilidzi Mudau
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user1245262
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1 Answers1

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I had a similar issue with ubuntu gnome 14.04 (Gnome 13.10). I have followed the same steps you mentioned, installing cuda 6.5 and removing 5.5 (that comes with the standard ubuntu repositories). After that cat /proc/driver/nvidia/version/ gave no results.

Moreover rebooting resulted in a failure in loading the login screen (the screen was fixed on the gnome splash screen). I could login with command line, using the command ALt + Ctrl + F1, but I wasn't able to have the GUI working.

After a day of trial and error of recovery attempts (and many Ubuntu reinstalls), I've found that the problem was gdm, so I solved my problem installing lightdm and rebooting with it. This was needed only for the first reboot after cuda installation, then I could revert to gdm.

Hope it helps.

Tshilidzi Mudau
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sparviero19
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