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error: unknown LVM metadata header?

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linux-howto

http://serverfault.com – I Upgraded to Ubuntu12.10, and when grub ran through the upgrade it gave me these errors: root@secure:/usr/share/grub# update-grub error: unknown LVM metadata header. error: unknown LVM metadata header. Generating grub.cfg ... error: unknown LVM metadata header. error: unknown LVM metadata header. error: unknown LVM metadata header. error: unknown LVM metadata header. error: unknown LVM metadata header. error: unknown LVM metadata header. error: unknown LVM metadata header. error: unknown LVM metadata header. ... I haven't rebooted yet, scared that if I do, the pc (HowTos)