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This questions is closely related with previous questions asked here. But there are some differences. I was trying to upgrade from 12.04 to 14.04LS. While download the packages, the system hanged suddenly. After waiting for an hour, I had to forcefully close everything. After this, the following things happened.

1> The last Linux kernel is not working and has been spoiled.

2> I used an older version of the kernel and managed to get internet connection. After this, I can not log in. Indeed I am getting the login screen. It does not allow allow me to log in and when I try, I get a similar screen like this and then it log out.

I believe that the unity is broken. I could manage to upgrade by using the command prompt. Still the problem is not getting sorted out. In fact, I tried the suggestions of the questions asked above. Using it, I can manage to get a graphical prompt for the guest session, not for my user id. Please help.

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Resetting Unity with the tweak tool worked for me. – hsivonen Dec 29 '14 at 10:36

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