[Bug 758951] Re: grub-probe fails on btrfs root with non-0 default subvolume id

[Tv]

Filed #1229438 for my troubles, it seems to be tied to the degraded
mode.

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Title:
  grub-probe fails on btrfs root with non-0 default subvolume id

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: grub2

  Rough outline: btrfs /, ext3 /boot. Used btrfs snapshots to rollback
  some changes -- mounted a non-0 subvolume ID. Now, update-grub fails
  when it tries to run "grub-probe --target=device /".

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