Comment 3 for bug 829074

I image the query that provides this report would get all the bugs that affect the distro that also affect a project without a packaging link with the distro. However, I do not think my simplified statement will work for the highlighted case.

Lp does not have a concept of official upstream, though Lp can know which Lp project provides code for a package presence of a packaging link for the distro and project. There is no determination of that project is owned by Canonical, an Ubuntu team, or has code that is 100% hosted in Lp. Ubuntu might have packaging link data like this:
    ubuntu -> xorg-video-intel
    ubuntu -> unity
So retargeting a bug from one upstream to another does help if both have packaging links. the goal would be for every source package in Ubuntu to have a packaging link.

I really do not know how to tell that a bug needs forwarding upstream looking at Lp's data. I think the crux of this issue is that for any ubuntu package, Lp must determine if there is a remote bug tracker for the Lp project. A query that provides this report would get all the bugs that affect the distro that also affect a project that has a packaging link with the distro, and has a remove bug tracker set, but does not have a bug watch. My head boggles at the steps needs to collect this data.