2

sudo umount -R /mnt 2>/dev/null
sudo mount /dev/nvme1n1p4 /mnt
sudo mkdir -p /mnt/boot/efi
sudo mount /dev/nvme1n1p3 /mnt/boot/efi

sudo mount --rbind /dev /mnt/dev
sudo mount --rbind /proc /mnt/proc
sudo mount --rbind /sys /mnt/sys
sudo mount -t devpts devpts /mnt/dev/pts

sudo chroot /mnt

grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=linuxmint --recheck
update-grub

exit
sudo umount -R /mnt
sudo reboot