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My Ubuntu 16.04 system was running OK until I allowed today's update. After the system reboot, I am not able to log in using GUI. After entering in my password, the system will pause, then after a bit the screen will go black, and then return to the login screen. One of the updates was an nvidia driver update nvidia-current:amd64 (304.131-0ubuntu3, 304.132-0ubuntu0.16.04.2) from /var/log/apt/history.log

When I remove the nvidia using 

$ sudo apt purge nvidia-*
The following packages will be REMOVED:
  nvidia-304* nvidia-common* nvidia-current* nvidia-opencl-icd-304*
  nvidia-settings*

the system works, although I think this is using base graphics. When I reinstall using 

$ sudo apt-get install nvidia-current nvidia-settings
The following additional packages will be installed:
  nvidia-304 nvidia-opencl-icd-304
The following NEW packages will be installed:
  nvidia-304 nvidia-current nvidia-opencl-icd-304 nvidia-settings

the system no longer logs in and is bad as before.

Some system info:

$ lspci | grep VGA
05:00.0 VGA compatible controller: NVIDIA Corporation G98 [Quadro NVS 420] (rev a1)

$ ls -latr .Xauthority
-rw------- 1 gallagherlab gallagherlab 86 Nov  4 14:25 .Xauthority

below did not change anything, bad permissions persist after reboot

rm .Xauthority 
sudo chown -R $USER:$USER $HOME 
chmod +x -R $HOME

I tried to install back to 304.131-0ubuntu3 using .run file but ran into X issues.

Any help to get this fixed would be appreciated.

Zanna
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user2730361
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  • Nvidia says the required driver for your card is 340, not 304: http://www.nvidia.com/download/driverResults.aspx/107868/en-us –  Nov 04 '16 at 21:01
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    Possible duplicate of Ubuntu gets stuck in a login loop – Fabby Nov 04 '16 at 23:14
  • Many thanks to all commenters, especially @CelticWarrior. It is notable that the nvidia driver version that I had worked fine for years but I installed 340 since that seemed to be correct. Install worked after dealing with X server issues helped by link of Fabby. System is now good. What I did listed below in case it is helpful. sudo service lightdm stop sudo update-initramfs -u #reboot sudo ./NVIDIA-Linux-x86_64-340.98.run – user2730361 Nov 07 '16 at 16:12

1 Answers1

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Reported/Confirmed as Bug #1639180. I had the same problem and ended up manually installing Nvidia-304.131 Note that you have to first install the MTRR patch to the Nvidia .run file (fairly easy to do ... instructions and the patch file can be found on-line).

Ubuntu-User
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