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I tried to install CUDA tookit 5.0 on ubuntu 12.04 and the installation proceeded OK.

After rebooting however, all I get is a terminal login. I've attempted to start the display manager with sudo start lightdm and it says all OK, but just hangs the prompt when it finishes loading without ever starting any display manager. sudo start gdm just flickers and goes back to the prompt.

There is no network connection on the machine either. It usually connects to a wireless network with remembered credentials.

What can I do to recover the machine?

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Uninstalling the cuda drivers didn't help? What packages did you install or what guide did you follow? –  hnasarat Nov 25 '12 at 3:28
    
I attempted to uninstall the cuda drivers by deleting the /usr/local/cuda-5.0 directory as the installer said, but that caused the screen to go totally black on reboot. I took the machine downstairs to get a wired internet connection, sshed into the machine, installed nvidia.com/object/linux-display-ia32-310.19-driver.html and now everything is working again. Sheesh, do not ever mess with CUDA. –  Nathan Nov 25 '12 at 3:37
    
Did you ever get CUDA working? –  dspyz Mar 17 '13 at 6:32
    
Yes, at a later point with a later version of the driver. I'm not sure how sorry. –  Nathan Mar 18 '13 at 18:20
    
@Nathan I also had problem installing CUDA from official packages: askubuntu.com/questions/404091 Can you please confirm my bug report here bugs.launchpad.net/ubuntu/+source/unity/+bug/1268211 –  NoBugs Jan 14 at 6:53
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