Problems after upgrading to 14.04 Show Only Black Screen

After upgrading to 14.04 few people face issue of really low graphics. Need to do few steps : On Black Screen, Press ALT + CTRL + F1 sudo apt-get install –reinstall ubuntu-desktop sudo apt-get install unity sudo apt-get purge nvidia* bumblebee* sudo apt-get install nvidia-prime sudo shutdown -r now   After restart, it will be …

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