It turns out that /dev/sdb6 has also been initialized as a physical LVM volume.
pvdisplay reports:
"/dev/sdb6" is a new physical volume of "97.56 GB"
--- NEW Physical volume ---
PV Name /dev/sdb6
VG Name
PV Size 97.56 GB
Allocatable
** Attachment added: "First 512 bytes of /dev/sdb6"
http://launchpadlibrarian.net/27123713/sdb6
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Installer garbled unrelated LVM partition
https://bugs.launchpad.net/bugs/380059
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