atdprhs

/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
root@ubuntu:/home/ubuntu# sudo update-grub /dev/sda1
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
root@ubuntu:/home/ubuntu# sudo update-grub /dev/sd1
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
root@ubuntu:/home/ubuntu# ^C
root@ubuntu:/home/ubuntu# sudo update-grub /dev/sdX
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
root@ubuntu:/home/ubuntu# sudo update-grub /dev/sda
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).