I have a laptop( sony vaio) with windows 10 and ubuntu. I had ubuntu12.x and I upgraded to ubuntu 14.04 (64 bit). My card is a nvidia geforce 540M. After the installation the laptop restarted and what I got was a black screen with a cursor blinking! I tried to use the recovery tools and I logged in as a root. I tried startx but I got error messages. No network access as well since I tried sudo apt-get update and I got again error messages. Any idea how to solve this problem?
George