installare driver nvidia su ubuntu 14.04 su asus K53SC

Se su /var/log dò il comando :

grep "WW" Xorg.0.log

l'output è questo:

(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[   154.250] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[   154.250] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[   154.250] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[   154.250] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[   154.250] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[   154.989] (WW) Warning, couldn't open module nvidia
[   154.992] (WW) Warning, couldn't open module nvidia
[   154.994] (WW) Falling back to old probe method for modesetting
[   154.994] (WW) Falling back to old probe method for fbdev
[   154.994] (WW) Falling back to old probe method for vesa

si notino i 'warning' per nvidia.

come posso installare i driver giusti?

grazie mille in anticipo per le risposte!