[Bug 972250] Re: "This GPT partition label has no BIOS Boot Partition"

[Stefan Bader]

It feels like this may got introduced by 1.99-20ubuntu1. And maybe the GPT partition is not the causing factor. My setup uses normal DOS partition table but I use a 2 stage boot where the first boot loader is in the MBR and then boots secondary grub stages from extended partitions. The installation was successful and on previous upgrade I did not notice anything wrong. But the upgrade today produced the "error: non-sector-aligned data is found in the core file" message. The common point is both cases use the deprecated blocklists.
In my case, luckily the system can be booted still. But there is an error on boot saying something about "outside partition" which has to be overridden by typing enter.

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https://bugs.launchpad.net/bugs/972250

Title:
  "This GPT partition label has no BIOS Boot Partition"

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  On a system installed with 11.10 and upgraded to 12.04 last week,
  today grub fails to apt-get upgrade with this error in
  /var/log/apt/term.log:

  /usr/sbin/grub-setup: warn: This GPT partition label has no BIOS Boot Partition; embedding won't be possible!.
  /usr/sbin/grub-setup: warn: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged..
  /usr/sbin/grub-setup: error: non-sector-aligned data is found in the core file.

  The system has luks+lvm as installed by 11.10 alternative installation
  cd, and indeed seems to have GPT but no BIOS partition (system is
  running BIOS on Asus F1A75V-PRO motherboard).

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