When I try to login to Ubuntu 14.04 from the GUI, it flicks back to the login screen. Also, I am not able to login via guest session.
When I try to login via Ctrl+Alt+f1, it shows I have logged in, but then a fraction of second later it again asks me to login again.
Is there any way to log in to the system?
Boot up your machine press the left shift and you will see this menu
boot up in recovery mode
now with this screen
select the second last option and drop to root user, test this if it works then create a new user and delete the earlier one.
To create new user : How can I create an administrator user from the command line?
Happened to me once when I updated my Nvidia drivers. If you are facing this after updating nvidia drivers , follow this,
Remove nvidia drivers
sudo apt-get remove nvidia-*
sudo apt-get autoremove
sudo nvidia-uninstall
