Unfortunately the eMMC doesn't appear under Other locations. Pretty sure it's dead.Did you click on 'Other locations' in Ubuntu's Files explorer ? If not the eMMC drive could be listed under that.
However after re-installing Ubuntu onto the 60 GB 2.5" hard drive while on the HP Stream I did get Ubuntu to come up and display properly on the Stream. So as a work around I can use the Stream, just need to have the 2.5" drive connected.
Apparently I must have loaded Ubuntu onto the USB using my HP desktop originally which might explain why it worked fine on the Desktop but not the HP Stream.