cscs
80
Unless you have some other image or way to boot.
You could maybe use grub commands to finger the boot path and image.
But its somewhat involved.
Here is a random quickly found search hit for a guide. I have not vetted it.
https://www.howtogeek.com/887757/how-to-use-grub-rescue-to-fix-linux/
Otherwise if you dont have something else in the system to boot from then chroot may be the next best option.