Comment 6 for bug 1579978

I've not managed to reproduce this. I tried installing upstart-sysv on a Wily cloud image and upgrading it to Xenial. This made the systemd preinst fail (which may be a separate bug) but I didn't see any openssh failure. I also tried installing upstart-sysv on a Vivid cloud image and upgrading that to Wily and then to Xenial. This worked without problems.

Installing upstart-sysv does remove ubuntu-standard as you say, so I'm not sure this is a supported path. So I'm marking Importance as Low on the basis that it is at least an uncommon path that will not affect the majority of users.

I'm not sure how this might make any further progress without steps to reproduce.