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

[Julian Andres Klode]

Oh I missed an @rbalint for the second paragraph.

Optimally we'd also replace any other automatically installed time-daemon (whether the provides are pre-focal or not) with systemd-timesyncd, because if the user did not explictly chose one of them, they should get the official standard supported one.
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https://code.launchpad.net/~rbalint/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/382454
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