Just FYI - That defect only impacted systems which boot from ZFS - mine did not. The installer would stop an upgrade if it found a mounted volume - it apparent

Just FYI - That defect only impacted systems which boot from ZFS - mine did not. The installer would stop an upgrade if it found a mounted volume - it apparently checks for zfs volumes as follows: sudo zpool list -H I could get around the installer's ZFS check by unmounting the drive: sudo zpool export poolname I upgraded. Then remounted the volume: sudo zpool import poolname Then I was up and running...