The selection of cities in tzdata has long been a source of frustration:
see for example bug 113718, bug 179885, bug 337330, bug 344348, bug
996853, and bug 997737. Ubuntu developers understandably defer to the
upstream maintainers, because, whoa, geopolitics. But the end result is
that we end up with a strange list, where cities show up multiple times
or don't show up at all.

We could, perhaps, filter the list to remove redundant items.
Unfortunately your suggestion of one entry per time zone wouldn't work,
because the biggest city in your time zone may be very far away. For
example, if you're in Houston Texas, the biggest city in your time zone
is Chicago Illinois, 1500 kilometres away.

I assume that the 12 results you got were:
Berlin Reinickendorf
Berlin Pankow
Berlin Koepenick
Bernau bei Berlin
Berlin
Berlin Mitte
Berlin Steglitz Zehlendorf
Berlin Wilmersdorf
Berlin Spandau
Berlin Tempelhof
Berlin Schoeneberg
Berlin Treptow

Of these, "Berlin" is listed as "PPLC" ("capital of a political
entity"), while the others are all "PPLX" ("section of populated
place"). <http://www.geonames.org/export/codes.html>

So if this is a reproducible problem, maybe we could filter out any PPLX
or PPL item when -- and only when -- there is a PPLC that (a) has the
same named time zone and (b) is within a given latitude+longitude of it.

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https://bugs.launchpad.net/bugs/1426400

Title:
  Time zone selection is really weird

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