I had installed Ubuntu 14.04 in my laptop. I was installing the updates and my laptop suddenly shutdown. After this when i start the laptop, only the initial login screen appears, when i type the username password it displays "Cannot login system problem detected" and returns to the login screen itself. Previously even if not logged icons (like wifi, shutdown icon) will be shown in top right corner now nothing is showing and also it displays network not connected, looks like wifi has been corrupted.
Is there any way we can login?? I tried with command prompt ALT + CTRL + F1. It is logging in. But i am not able to get the graphical display.