[ZorinOS]Nvidia GTX 850M

Hello! I’m new linux user and I have 2 graphic cards:

  • Intel
  • Nvidia GTX 850M

Actualy I’m on Zorin OS 9 and I have problem with drivers installation. I’m installing drivers this way:

sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
sudo apt-get update
sudo apt-get install nvidia-current

After rebooting whole system is working good but not my video setting - I have setted screen display as nvidia (I can see this in config file):

screen0 'nvidia'
ignore 'intel'

But I have found something like that in logs:

Undefined Screen "nvidia" referenced by ServerLayout 'layout'

IMHO Zorin don’t see Nvidia Card. So how I should install drivers?

I have a hope that, I described my problem good enough, sorry for bad English ;)