I previously tried to install my nvidia graphics card driver more than 50 times when this version was released (14.04) and every time i always got either blank screen, terminal only with no x-server or it would go back to the first alternative driver there was when it was installed.
This was the only reason why i stopped using linux (ubuntu). now im trying to give it another try but i need real detailed help and guidance. I have tried many ways and techniques from forums here and the result was never great.
**My PC (laptop)
- Intel i5 4200/intel hd integrated video graphics
- 8gb ram
- 500gb hdd**
- nvidia geforce 720m
Best Answer
I realize this may just be linking you to another page of instructions, but this one worked perfectly for me and I keep it bookmarked as a fallback:
http://mylinuxexplore.blogspot.com/2014/03/solved-nvidia-cant-access-secondary-gpu.html?m=1
I am running on a Lenovo Y50 with an Intel i7 / Geforce GTX 860M and for whatever reason I can only get the nvidia-331-updates drivers to work as this link suggests. Literally any other nvidia driver will leave me with the same problem you are describing. It seems like its hit or miss with this Optimus technology. Hopefully we will get a good update for it in the near future.