To have all the partitions listed in ubiquity it did also work for me to unmount everything that had been mounted on my hard drive.
However, this turned out to be a major problem as I had previously used UNetbootin to set up a partition to boot and install Xubuntu from on that same hard drive.
I was also wondering why there was anything being mounted from my hard drive in the first place except for the partition where I intended to be installing from?
To have all the partitions listed in ubiquity it did also work for me to unmount everything that had been mounted on my hard drive.
However, this turned out to be a major problem as I had previously used UNetbootin to set up a partition to boot and install Xubuntu from on that same hard drive.
I was also wondering why there was anything being mounted from my hard drive in the first place except for the partition where I intended to be installing from?