No nvidia-drivers

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http://askubuntu.com – I have a dell m4600 with nvidia quattro K2000m. When first installing ubuntu it shows 2 experimental drives in "additional driver" After reboot there gone. And I don't have any /etc/X11/xorg.conf . It doesn't exist. And ubuntu can't recognice the graficscard. It says "unknown" External monitor works through vga, but not hdmi or display-port. Any tips on what's wrong and what to do? (HowTos)