sudo mount /dev/sda7 /mnt
sudo mount /dev/sda7 /mnt/boot
sudo mount --bind /dev /mnt/dev

root@mint /boot # sudo grub-install
sudo: unable to resolve host mint: Connection refused
grub-install.real: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
root@mint /boot # grub-install
grub-install.real: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
root@mint /boot # sudo grub-install /dev/sda
sudo: unable to resolve host mint: Connection refused
grub-install.real: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
root@mint /boot # sudo grub-install
sudo: unable to resolve host mint: Connection refused
grub-install.real: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
root@mint /boot # sudo grub-install --target /dev/sda
sudo: unable to resolve host mint: Connection refused
grub-install.real: error: /usr/lib/grub/dev/sda/modinfo.sh doesn't exist. Please specify --target or --directory.
root@mint /boot # sudo grub-install --directory /dev/sda
sudo: unable to resolve host mint: Connection refused
grub-install.real: error: /dev/sda/modinfo.sh doesn't exist. Please specify --target or --directory.