If the map let you pick any arbitrary point rather than having to pick a specific city in the TZ database, that would actually be a better way than a list of cities. See the discussion elsewhere in this thread about mapping Salt Lake City -> (Boise vs Denver).

(I don't think the TZ database contains the information to do this though, but maybe it should?)

Why would you use Ubuntu in the first place?

Because it works? Why wouldn't you?

The good option is not to yell at clouds but to open a bug report, provide a patch, use Debian or change it after install.

I change it after install, but let's be realistic: I'm not Linus Torvalds or Guido von Rustum, it's not like they would listen to me or take my patch.