Fix grub in encrypted Ubuntu (~18.04)

fix-grub-encrypted.sh

#!/usr/bin/env bash

#
# Sources:
#   - https://askubuntu.com/questions/844132/how-to-repair-boot-on-luks-encrypted-harddrive
#   - https://gist.github.com/samuelcolvin/43c5ed2807e7db004b1058d0c9bfb068
#   - https://unix.stackexchange.com/questions/178666/sbin-cryptsetup-not-found-on-boot
#


sudo cryptsetup luksOpen /dev/nvme0n1p8 nvme0n1p8_crypt
sudo vgscan --mknodes
sudo vgchange -ay
sudo mount /dev/mapper/nvme0n1p8_crypt /mnt
sudo mount /dev/nvme0n1p7 /mnt/boot
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
sudo chroot /mnt
apt -y remove grub-pc
apt -y install --install-recommends grub-pc grub2-common
update-initramfs -c -k all
update-grub2
exit
sudo umount /mnt/boot
sudo umount -l /mnt
sudo vgchange -an
sudo cryptsetup luksClose nvme0n1p8_crypt