[Bug 1292628] Re: 'grub-install --force "(hd0)"' fails on trusty during installation

[Steve Langasek]

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

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  Network/PXE installs of Trusty fail on installing grub.

  The error message in syslog is:

  Installing grub on '(hd0)'
  Running chroot /target grub-install --force "(hd0)"
  Installing for i386-pc platform
  grub-install: error: disk `hd0' not found
  error: Running 'grub-install --force ''(hd0)''' failed.

  The workaround is the following

  chroot target
  echo "(hd0) /dev/sda" > /boot/grub/device.map

  Then prompting the installer to try installing again.

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