error: Unknown LVM metadata header

$ sudo update-grub2
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
Found linux image: /boot/vmlinuz-2.6.31-14-generic
Found initrd image: /boot/initrd.img-2.6.31-14-generic
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
Found linux image: /boot/vmlinuz-2.6.31-11-generic
Found initrd image: /boot/initrd.img-2.6.31-11-generic
error: Unknown LVM metadata header
error: Unknown LVM metadata header

решение рискованно и не факт что поможет, но у меня ошибки эти пропали.

dd if=/dev/zero of=/dev/sda1 bs=512 count=2
dd if=/dev/zero of=/dev/sdb1 bs=512 count=2