I spent a lot of time to install Debian and Ubuntu on my new Asus UX431FA because of a black screen after the grub choice of Linux. Sharing my script here.
while into the grub and your cursor is on your linux distro, press 'e' instead of enter.
add 'nomodeset' at the end of the line containing 'quiet'
press F10
if you get a black screen on Debian, press ctrl+alt+F4 to get into a shell
clone this repository and get into it
execute the script as root: ./black-screen-fix-ubuntu.sh (the Debian's one if you are in this case)