Happened to me too when I updated my vivid system after a few weeks again.
I still have upstart-bin (1.13.2-0ubuntu9) from before the transition to upstart installed and tried to upgrade it.
init-system-helpers has a Replaces/Breaks on the transitioned upstart package but not on the upstart-bin from before the transition. Trying to upgrade upstart-bin first doesn't work as this pulls init-system-helpers too and apt tries to upgrade init-system-helpers before upstart-bin.
init-system-helpers should also get a Replaces/Breaks on the old upstart-bin package. I assume upgrades from utopic (which have upstart-bin with files) to vivid are also affected by this.
Happened to me too when I updated my vivid system after a few weeks again.
I still have upstart-bin (1.13.2-0ubuntu9) from before the transition to upstart installed and tried to upgrade it.
init-system-helpers has a Replaces/Breaks on the transitioned upstart package but not on the upstart-bin from before the transition. Trying to upgrade upstart-bin first doesn't work as this pulls init-system-helpers too and apt tries to upgrade init-system-helpers before upstart-bin.
init-system-helpers should also get a Replaces/Breaks on the old upstart-bin package. I assume upgrades from utopic (which have upstart-bin with files) to vivid are also affected by this.