Well, I wonder if adding
nomodeset to grub is all you need. You may need a different Nvidia driver. But you must access the build in order to do either.
If you use the LiveUSB, you can mount the partition to update grub:
Following the above guide, before running
sudo update-grub, you will need to run
sudo nano /etc/defaul/grub
nomodeset behind "quiet splash" to make it "quiet splash nomodeset"