I'm seeing the same issue per https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=740271. I've updated the bug with my comments.
┌──────────────────────┤ [!!] Partition disks ├───────────────────────┐ │ │ │ Volume group name already in use │ │ The volume group name used to automatically partition using LVM is │ │ already in use. Lowering the priority for configuration questions │ │ will allow you to specify an alternative name. │ │ │ │ <Go Back> <Continue> │ │ │ └─────────────────────────────────────────────────────────────────────┘ Has anyone seen this before and/or know of a way to sort this? Cheers, Sandeep.