I updated my Ububtu 14.04 LTS to 16.04 LTS. I have HP Pavilion 15ab 030tx. My nvidia graphics card is not being detected. Instead X.org was installed and is being used. What to do?
Here's some additional reference.
On the chance that you have installed your drivers, but your card simply isn't being recognized, I'd make sure to be using Nvidia's drivers. Not Nouveau. Personally I've had issues in the past with my card not being recognized after installing Nouveau drivers, however, after purging the packages and installing the regular Nvidia drivers, I was able to move along just fine.