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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