[Bug 1294638] Re: os-prober does not detect ubuntu installations in btrfs subvolumes with EFI partitioning

[Esokrates]

See the upstream bug report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=688336
Fedora does not have this problem, it ships patched packages, see https://bugzilla.redhat.com/show_bug.cgi?id=888341
Work has been done by Gene Czarcinski, but upstream has not yet merged his work.

** Bug watch added: Debian Bug tracker #688336
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=688336

** Bug watch added: Red Hat Bugzilla #888341
   https://bugzilla.redhat.com/show_bug.cgi?id=888341

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https://bugs.launchpad.net/bugs/1294638

Title:
  os-prober does not detect ubuntu installations in btrfs subvolumes
  with EFI partitioning

Status in os-prober package in Ubuntu:
  Confirmed

Bug description:
  I am running Kubuntu 14.04 beta 1 installed in a btrfs filesystem on a GPT-partitioned hard disk (my machine has an EFI bios).
  I also have Ubuntu 13.10 installed on the same machine in another partition, also btrfs.

  os-prober from Kubuntu 14.04 does not detect the 13.10 kernels, most
  likely because they lie in the normal subvolume @ created by Ubuntu.
  If I mount the @ subvolume somewhere and then run update-grub the
  kernels are detected, but the path written in grub.cfg is then wrong
  because it ignores the subvolume and treats the kernels like they are
  in the btrfs root volume.

  This is always reproduceable: Install Ubuntu 13.10 in one btrfs
  partition, install Kubuntu 14.10 in another. Run update grub in
  Kubuntu 14.10. The Ubuntu 13.10 kernels are not detected.

  This is the os-prober package info:

  Package: os-prober
  Architecture: amd64
  Version: 1.63ubuntu1

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