There a few things you could try. Diable Windows 10 fast start: [https://www.asus.com/support/FAQ/1045548][1]
Reboot into Ubuntu. If you still get the ominous blinking cursor, hit CTRL+ALT+F3, and log in from there. Type sudo apt-get -f install
Look at the errors, if any.
If you can't get to a terminal, reboot into Ubuntu and hit 'e' really quick. That will bring up the boot layout of GRUB. At the end of the kernel line put /bin/bash
or init 1
Then hit CTRL+x.
Enter the root password, if you made one. Otherwise, I'm not sure how Ubuntu handles login from init 1
But once you're in, sudo apt-get -f install
again.
If none of that works, but you can get to a terminal, or log into init level one init 1
try sudo apt-get remove --purge nvidia-driver
then reboot or gdm3