When i try to log in i automatically log out

Question

So when i try to log into ubuntu 17.04 gnome, the monitor blacks out for a few seconds and then i am logout again... and when i try again to log in same happens.

All this started because i wanted to install vulkan and followed a guide where i had to install the latest nvidia drivers for linux manually... everything worked well but then i restastarted the computer and got into this loop...

I tried to remove nvidia drivers through the console but no rault.. i tried to add a new user and log in but again it automatically logs out (i can log in only in console)

I tried all this askubuntu.com/questions/942810/ubuntu-logs-out-immediately-after-logging-in

But nothing....

There be a way to fix this..

Answer 1

Ok found the solution, as I said in my particular case the problem was "display related" (later on I realized it was driver related) since the problem started when I tried to update my Graphics driver which seemed to have been successful since I had video output and no issues after the installation but all the log-in problems described above materialized after I restarted the computer.(also sorry for the typos I had to post this question from a cellphone :P )

First I thought I would be ok simply by Ctrl + Alt + F2 and then log in the console and:

sudo apt-get remove nvidia-*
sudo apt-get autoremove

Thinking that nouveau or some default setting would take over which then would allow me to log in the gnome desktop but I was wrong (deleting the problematic driver was a good step though)

Turns out that I needed to reinstall the nvidia drivers too, so I did that by:

sudo apt-get install nvidia-current
sudo apt-get update
sudo apt-get upgrade

Which doesn't update to the latest supported/tested version for ubuntu but I did not care to look into how to do that (probably instead of -current you type in the version number or you add the nvidia PPA but I wasn't sure about what the latest version available for ubuntu was nor what to type in for the nvidia PPA and did not want to research it since if this worked I could log in to my desktop and just graphically select the latest version from the Software & Updates manager which I did)

Then I pushed Ctrl + Alt + SysRq + R + E + I + S + U + B

(you have only to hold Ctrl + Alt + SysRq the others you can type in a serial manner one by one oh and SysRq is the print screen button in case your keyboard doesn't have both labels or a dedicated sysrq button last but not least not all of those commands (buttons) work if not previously enabled by you.. for more info about this go here Also even if most of them dont work some of them should work like U,S and B which is better than nothing I guess and will safer restart your system - I was kinda afraid to just shutdown but it could also work without hanging anything I am a noob though so I did not want to leave it to chance :P - )

And everything works now :)