Comment 14 for bug 1570901

This regression was introduced by http://bazaar.launchpad.net/~ubuntu-installer/ubiquity/trunk/revision/6411.2.2 for bug 1567194.

This change both introduced the dependency cycle, it's pointless (as After= does not do *anything* about starting new units), and thus it does not actually fix bug 1567194. Thus for now I'm going to reopen the latter and revert that change.