I have a fresh installation of Lucid with manually modified lvm2
partitions. I have /dev/sda1 as ext2 /boot partition, while /dev/sda5 is
a PV for the LVM2. I got the same header checksum error from all lvm2
tools and update-grub.

Doing a "pvscan" revealed that /dev/sda1 is an available PV member of
the LVM, when it's only used as a standard partition for /boot. I don't
know if that's good or bad, but Mike's solution worked. However I had to
do some extra steps on a running system:

  - umount /dev/sda1
  - pvremove /dev/sda1
  - blkid /dev/sda1
and then replace the UUID into /etc/fstab where /dev/sda1 is mounted (/boot)
  - mount /dev/sda1

-- 
Unknown LVM metadata header
https://bugs.launchpad.net/bugs/452350
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