Ubuntu: Upgraded from 14.04 to 16.04 and get a black screen on login [duplicate]



Question:

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I had Ubuntu 14.04 LTS on my Dell laptop.

Today I got a pop up for upgrade to 16.04.2 and tried to upgrade it. During the upgrade the screen got frozen after 15 min I decided to shut it down. After turning it on again the screen went blank and it showed Ubuntu 16.04.2 LTS tty1 and told me to log in. The screen was black and this text was in white font.

The main problems came when it showed

incorrect login  

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