If you do actually find someone at Ubuntu who knows about this, perhaps you can ask them to comment on this thread:
https://www.virtualbox.org/pipermail/vbox-dev/2016-July/013926.html
I note that the person asking the question seemingly never bothered to create an Ubuntu bug, so it can't have been that important to them.
If you do actually find someone at Ubuntu who knows about this, perhaps you can ask them to comment on this thread:
https:/ /www.virtualbox .org/pipermail/ vbox-dev/ 2016-July/ 013926. html
I note that the person asking the question seemingly never bothered to create an Ubuntu bug, so it can't have been that important to them.