systemd update conflicts with upstart

Question

On my Ubuntu Server 18.04 (originally installed as 14.04 and upgraded to 18.04 few months ago), systemd update has now been "kept back".

I looked at it in aptitude and it says that dependencies are not satisfied:

systemd(upgrade, 237-3ubuntu10.29 -> 237-3ubuntu10.31) conflicts with upstart

I know Ubuntu used to use upstart but have no idea if my installation still uses it or if it's safe to remove it. It's a production server. I can have down time only during weekend. I would very much like to avoid breaking it by messing with the boot process.

What should I do and how?

David Novák · Accepted Answer

Solution was to simply remove package upstart.
If you encounter same situation, be sure to do following before removing upstart:

check that upstart isn't actually used (you can check name of executable for init process)
backup your system

systemd update conflicts with upstart

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