The code in grub-installer does the following:
# Try to avoid using (hd0) as a boot device name. Something which can be
# turned into a stable by-id name is better.
default_bootdev_os="$($chroot $ROOT grub-mkdevicemap --no-floppy -m - | head -n1
| cut -f2)"
if [ "$default_bootdev_os" ]; then
default_bootdev="$($chroot $ROOT readlink -f "$default_bootdev_os")"
else
default_bootdev="(hd0)"
fi
So it would be useful to know the output of the intermediate commands in
your environment.
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https://bugs.launchpad.net/bugs/1292628
Title:
'grub-install --force "(hd0)"' fails on trusty during installation
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