[Merge] ~rbalint/ubuntu-release-upgrader:ubuntu/master into ubuntu-release-upgrader:ubuntu/master

[Julian Andres Klode]

The reason being that we do want to install systemd-timesyncd if no time-daemon was previously installed, and not by accident some other time-daemon because something somewhere has a depends wrong.
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https://code.launchpad.net/~rbalint/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/382454
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