Comment 7 for bug 333215

It is not. For example, Ubuntu Software Center tracks bugs only on the package <http://bugs.launchpad.net/ubuntu/+source/software-center>, but it is still possible for people to accidentally add an existing bug report to <https://bugs.launchpad.net/software-center>. There is no way making "Forwarding bugs for Ubuntu packages upstream" easier would fix that problem at all -- there is no upstream to forward to.