Comment 3 for bug 83105

Ah, I see. When apport runs, it does not check the dpkg database for the originin of the executuable, it just applies some heuristics (checking dpkg takes ages).

And since /usr is reserved for distro packages (you should put custom stuff into /usr/local/), this usually does the right thing.

Not displaying the dialog would be confusing if you previously got a bomb icon in update-notifier. It's a bit tricky to get this right.