reopen 1020290 severity 1020290 critical stop In case you didn't notice, there's a real bug here.
Your broken init-system-helpers package breaks apt upgrade and dist-upgrade, and since this is an Essential package, that makes it a critical bug. It doesn't matter at all whether you like my tone or not (I didn't like your condescending and dismissive tone in your reply to my bug report, but I doubt you give a damn about that either). There's a critical bug in your package and you need to fix it. craig