Code review comment for lp:~unit193/ubuntu-release-upgrader/core-upgrades

I'll admit straight away that I don't know enough about the release-upgrader to be able to technically review this MR, I hope ubuntu-core-devs (or someone else more experienced with this) will take care of that part.
However, the change Unit193 describes above is what we want. Approving this as Xubuntu Project Lead.