Ive had this same problem. I have an nvidia 960m in my laptop using nvidia-390. 
After I upgraded, I got the “Option is not a valid keyword...” as well. For 
future refernce, you can get a rudamentary GUI 
1. apt removing and apt purging all things nvidia then rebooting
2. At the GRUB screen, add “nomodeset” to the kernel parameters
3. Upon arriving at the lightdm login screen, switch to TTY 1 with ctrl + alt + 
F1 and chown the .Xauthority file to your_user:your_user
4. Switch back to the login with ctrl + alt + F7 and login like usual.

It’ll look ugly but it works. Tested on Unity.

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https://bugs.launchpad.net/bugs/1752053

Title:
  nvidia-390 fails to boot graphical display

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