your installing the newest ubuntu correct?
Are you sure its not showing you that the hard drive is already partitioned to windows? If it does say you have no partitions, then just create a partition there! it should take it from there.
hmmm.... thats pretty strange. Do you have windows or another OS already installed on the HDD? You may want to download g-parted and just do full reformat of the drive and format it as XFS file system.
Well before you go any further, is there anything on the windows partition that you need to keep? If so, back it up.
Then download g-parted and burn it to a cd and boot the cd. Follow the g-parted commands which are really easy and will allow you to delete everything on the drive then reformat the unused space so ubuntu can be installed. You can leave it as unallocated space or format it as XFS.