Comment 3 for bug 1479340

Adding Ubuntu task as well as this impacts the latest packages as well.

The horizon package generally needs unpicking and putting back together to ensure that compress/collected assets are separated from those provided by the package itself; we don't currently use /var/lib/horizon at all so we should look to make those changes.

That said its non-trivial - I'd hope to look at this for newton, but we're not far off release now.