Public bug reported:

Binary package hint: grub2

btrfs reserves the first 64kiB for boot loaders as its CoW (Copy-On-
Write) features mean that a file may change logical blocks.  This area
may also be referred to as the "embed area", "embedded area" or
"embedding area", depending on the context.  core.img must be installed
to this area to ensure that other files may be read appropriately.

This depends on (LP: #757446) which has already been fixed.  A patch
resolving this has seen some testing already.

** Affects: grub2 (Ubuntu)
     Importance: Medium
     Assignee: Colin Watson (cjwatson)
         Status: Triaged

** Affects: grub2 (Ubuntu Natty)
     Importance: Medium
     Assignee: Colin Watson (cjwatson)
         Status: Triaged

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https://bugs.launchpad.net/bugs/759772

Title:
  grub2: btrfs: does not install core.img to boot block

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