By default, when you select "use network time protocol" (or whatever
it's called), it does not automatically select a time server for you.
It should, even if it's one randomly from the list.
I don't think this can be done bullet-proof, i.e. a random NTP server
might not be accessible from the network the machine lives in,
resulting in timeouts while booting, error messages plenty and other
Unless you can give me a bullet-proof method how this can be achieved,
I won't do this due to the reasons in comment #1. Closing as NOTABUG.