[Bug 1487365] [NEW] Ubuntu14.04 .3 RAID installation fails on firestone

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Problem Description
=======================
Installation goes smoothly, until it reaches grub installation, and fails with fatal error there.
 
Machine Type = pio-firestone 
 
---boot type---
QEMU direct boot kernel/initrd
 
---Kernel cmdline used to launch install---
kexec -l /root/vmlinux.venkat -i /root/initrd.gz.venkat
kexec -e

== Comment: # - Venkat R. B <venkatb3 at in.ibm.com> - 2015-08-14 08:08:41 ==
I am trying to install Ubuntu14.04 on the firestone machine on a RAID1 array, configured with software raid.
Installation goes on smoothly till its reaches grub loader and fails. Below I have pasted the error.

             ?? [!!] Install the GRUB boot loader on a hard disk ??
  ????????????                                                    ? ?????????
  ?          ?        Unable to install GRUB in /dev/md0p1        ?         ?
  ?          ? Executing 'grub-install /dev/md0p1' failed.        ?         ?
  ?          ?                                                    ?         ?
  ? Running "? This is a fatal error.                             ?         ?
  ?          ?                                                    ?         ?
  ????????????     <Go Back>                       <Continue>     ? ?????????
             ?                                                    ?
             ??????????????????????????????????????????????????????

== Comment: # - Mauricio Faria De Oliveira <mauricfo at br.ibm.com> - 2015-08-20 09:31:11 ==
grub-installer pieces from syslog

Aug 19 11:07:43 grub-installer: info: Installing grub on '/dev/md0p1'
Aug 19 11:07:43 grub-installer: info: grub-install does not support --no-floppy
Aug 19 11:07:43 grub-installer: info: Running chroot /target grub-install  --force "/dev/md0p1"
Aug 19 11:07:43 grub-installer: Installing for powerpc-ieee1275 platform.
Aug 19 11:08:01 grub-installer: grub-install: error: failed to copy Grub to the PReP partition.
Aug 19 11:08:01 grub-installer: error: Running 'grub-install  --force "/dev/md0p1"' failed.

and the "error:" message 'failed to copy Grub to the PReP partition.' is
not generated by the grub-installer script itself [1], so probably
coming down from grub2.

I'd suggest to either involve our grub2 guy (not sure if available), or
mirroring to Canonical.


[1] http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/trusty/grub-
installer/trusty-updates/view/head:/grub-installer

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-ppc64le bot-comment bugnameltc-129040 severity-critical targetmilestone-inin---
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Ubuntu14.04 .3 RAID installation fails on firestone
https://bugs.launchpad.net/bugs/1487365
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