[Bug 1672548] [NEW] fresh install fails - grub boot loader failed to install

[kelargo]

Public bug reported:

grub boot loader failed to install

have multiple disks. no other OS present. just multiple disks. 
installing to boot off /dev/sdg  unable to write MBR.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.3
ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
Uname: Linux 4.8.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CasperVersion: 1.376.2
Date: Mon Mar 13 17:27:44 2017
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Xubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug ubiquity-2.21.63.3 xenial xubuntu

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https://bugs.launchpad.net/bugs/1672548

Title:
  fresh install fails - grub boot loader failed to install

Status in grub-installer package in Ubuntu:
  New

Bug description:
  grub boot loader failed to install

  have multiple disks. no other OS present. just multiple disks. 
  installing to boot off /dev/sdg  unable to write MBR.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubiquity 2.21.63.3
  ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
  Uname: Linux 4.8.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CasperVersion: 1.376.2
  Date: Mon Mar 13 17:27:44 2017
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Xubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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