Comment 3 for bug 1758019

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Frank Heimes (fheimes) wrote : Re: [Ubuntu 18.04] No follow-up to the "Configuring the clock" dialog when not accepting the time zone

It's probably similar like you want to try.
In this case geoip response with UK/London (because that's were the intranet/internet passage is), but the system itself is in Germany, hence Europe/Berlin is selected.