Comment 2 for bug 1244211

That looks like a problem with the download service not sending us the necessary signals. I'll bet it's unreproducible right? ;)

Eventually, the reactor would timeout anyway (default is 10 minutes), but that probably wouldn't help you debug this much. If you wanted to, you could set the environment variable SYSTEMIMAGE_REACTOR_TIMEOUT to some huge number of seconds and see if it's just a slow network connection. While you're doing that, tail /var/log/system-image/client.log for details about system-image-dbus and (I think) /home/phablet/.cache/ubuntu-download-manager/ubuntu-download-manager/ubuntu-download-manager.log (!) for details about what's happening in the dl service.

Best guess is that it's just an intermittent networking problem.