I don't think this is a regression, but it does seem that occasionally a
btrfs filesystem gets into a state where GRUB can't read it.  This may
be a problem in btrfs or it may be a problem in GRUB; at the moment I
can't tell.  It would be good if we could debug it before you reboot,
though.

Could you please provide the same grub-probe output, but this time with
-vv rather than just -v?

** Changed in: grub2 (Ubuntu)
       Status: Fix Released => Incomplete

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https://bugs.launchpad.net/bugs/732149

Title:
  [natty] btrfs "grub-probe: error: unknown filesystem"

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