ubuntu@ubuntu:~$ sudo mount /dev/sda1 /mnt
ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt /dev/sda
/usr/sbin/grub-setup: warn: Sector 32 is already in use by FlexNet; avoiding it. This software may cause boot or other problems in future. Please ask its authors not to store data in the boot track.
Installation finished. No error reported.
ubuntu@ubuntu:~$ sudo update-grub --output=/mnt/boot/grub/grub.cfg
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
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