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I'm using Ubuntu 12.04 LTS (Precise Pangolin) with grub 1.99.

I installed on a RAID10 multidevice BTRFS partition. I thought that multidevice support had been included in grub for a while, but on boot, I'm dropped to a initramfs shell because it fails to mount root ("invalid argument").

This is actually the same message I get if I want to mount a btrfs volume without executing btrfs device scan.

Therefore I wonder: Does Ubuntu's grub version even support boot from btrfs mutlidevice?

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