Ubuntu – Unity fails to start after booting

14.04unity

I am using UBUNTU 14.04.2 on my lenovo E531 laptop.My problem is: after booting the computer,graphical interface of ubuntu fails to start and it shows a black screen. I'd consider myself a beginner, but I know how to use terminal commands on the TTY screen a little bit.
I appreciate any help/guidance in advance.

Update:
i have tried lots of different methods but the result is :failure 🙁
i installed gnome shell :
http://itsfoss.com/how-to-install-gnome-in-ubuntu-14-04/
but at the end the black screen is all i have
i also tried this method :
Blank screen after installing nvidia restricted driver
but the result was not helpful again

my Nvidia driver is Nvidia-331, and it was working fine before this problem

Best Answer

I would suggest starting with opening a terminal and checking the output of:

/usr/lib/nux/unity_support_test -p

If everything shows yes, your graphic card shouldn't have a problem with unity. If not, you'll have to switch something your graphic card supports, gnome is an alternative to unity.

Given that the problem isn't your graphic card and you havn't installed any new graphic drivers prior to this error I would suggest to reinstall unity.

sudo apt-get install ppa-purge
sudo ppa-purge ppa:unity-team/staging

sudo apt-get update
sudo apt-get install --reinstall ubuntu-desktop
sudo apt-get install unity