Did a apt dist-update on Ubuntu 18.04 couple of days ago. The system is stuck on grub prompt since then.
Have attempted to resolve this by booting into Ubuntu Live DVD, mounting and chroot'ing into the system to reinstall grub by grub-install --no-nvram --root-directory=/; update-grub. There are no errors printed. Also tried reinstalling grub-efi-amd64 and grub-efi-amd64-signed packages. Again, no errors.
Also followed the steps outlined here without any luck. The 'grub-efi-amd64-signed' package failed to install target/
Ubuntu is the only OS installed on this system.
My next step is to try using the boot-repair utility to try and get the system back.
Any ideas on what is causing this? That would help me understand on how I can resolve this and/or to prevent this from happening in the future?