Comment 9 for bug 452350

I had this same problem. Leftover LVM metadata from some failed installs (due to bad RAM) caused pvscan to see my /boot partition as an extra erroneously-sized pv (~950GB instead of ~250MB). Unmounting /boot, running "pvremove /dev/sda1", replacing the UUID string in /etc/fstab with /dev/hda1, and /boot is back to normal working order. I haven't done a full reboot test yet, but I'd be surprised if the error returns, or if I have boot problems.