You are meant to be able to report bugs against _binary_ package names. ubuntu-bug linux is a convenience so we so not have to show users how to work out what they binary linux-image-* package actually is at the time they file the bug. In all cases we want ubuntu-bug linux to do the right thing, and I have hopefully sorted that on your other bug. If that covers what you needed here so close this one out as a DUP of that other bug.
You are meant to be able to report bugs against _binary_ package names. ubuntu-bug linux is a convenience so we so not have to show users how to work out what they binary linux-image-* package actually is at the time they file the bug. In all cases we want ubuntu-bug linux to do the right thing, and I have hopefully sorted that on your other bug. If that covers what you needed here so close this one out as a DUP of that other bug.