[Bug 1030223] Re: grub fails to installon dev/mapper

[Rsus]

In lenovo z860, i used gparted standalone from dvd to create multiple partitions.
Ntfs ones were then used to install win 7 professional 64 bit.
then in remaining 1 partition i created extended partiation (not starting in logical/some boundary), within which i created boot, root, user and swap partitions.
Then used current lts ubuntu installer from dvd and after it got all the details from me, during install of grub, it failed with error that could not install and so the boot would not work, and took me through bug reporting.
I am stuck and really want to start using ubuntu.
pls help.

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https://bugs.launchpad.net/bugs/1030223

Title:
  grub fails to installon dev/mapper

Status in “grub-installer” package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  I'm trying to install Ubuntu 12.04 64bit on Sony Vaio Z131A2JL alongside Windows 7.
  I've created a partition of free space for Ubuntu on Windows first then created 4 partitions (/boot, /, /home, and swap)
  using the Ubuntu installer on /dev/mapper (I saw that tutorials mention /dev/sda but this was not in the option for me).

  The installer then failed with an error message

  "Unable to install GRUB in /dev/mapper. Executing grub-install
  /dev/mapper failed. This is a fatal error."

  I've tried installing GRUB on the /boot partition specifically but
  this failed as well.

  Please let me know what I can do to have this fixed.

  Best Regards,

  E.L.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: ubiquity 2.10.16
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  Uname: Linux 3.2.0-23-generic x86_64
  ApportVersion: 2.0.1-0ubuntu5
  Architecture: amd64
  CasperVersion: 1.315
  Date: Sat Jul 28 01:16:21 2012
  InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  ProcEnviron:
   LANGUAGE=en_CA.UTF-8
   TERM=unknown
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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