[Bug 908109] Re: [Oneiric Precise] 64-bit installer incorrectly detects EFI instead of MBR for Grub, boot fails, Lenovo B570

[YannUbuntu]

Hello Brian, thanks for your tutorial.

Is the "sudo sync" command really necessary ? what is it for?

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https://bugs.launchpad.net/bugs/908109

Title:
  [Oneiric Precise] 64-bit installer incorrectly detects EFI instead of
  MBR for Grub, boot fails, Lenovo B570

Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  There is a wiki article to describe and help fix this issue here:
  https://help.ubuntu.com/community/forum/hardware/LenovoB570

  As per the forums, this is a 64-bit laptop, and the 64-bit Live CD
  "Try Ubunut" mode works perfectly on it, but when installed to disk
  the Grub boot loader doesn't work.

  I selected the option to resize the Windows partition and install
  Linux, and it did everything perfectly, but would not boot Linux
  afterwards. The system came up into the Windows 7 black "start in safe
  mode" option screen. If the Active Partition flag for the Windows boot
  partition (/dev/sda1) is turned off, then the system will not boot
  from hard drive at all, and falls through to the next boot option in
  the BIOS, which by default is PXE.

  Also as per the forums, the 32-bit Oneiric installer works fine ... I
  bought the laptop for my 74-year old father for Xmas and he is
  unlikely to care about using all 4GB of RAM, or running 64-bit VMWare
  setups, so I just did the workaround of using the 32-bit installer to
  reformat the Linux / partition (/dev/sda6) and install 32-bit Ubuntu.

  I have included a copy of the partition table, boot block and
  /boot/grub as laid down by the 64-bit installer.

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