What version of grub2-common do you have installed? Does 'which grub-install' point to a file provided by the grub2-common package?
From what I can see, all versions of grub-install in Ubuntu, back to 14.04 and earlier, correctly pass an argument to -d.
What version of grub2-common do you have installed? Does 'which grub-install' point to a file provided by the grub2-common package?
From what I can see, all versions of grub-install in Ubuntu, back to 14.04 and earlier, correctly pass an argument to -d.