[Bug 2055718] Re: timezone changed unexpectedly from EST to America/Adak

[Benjamin Drung]

The test case can be distilled down to:

```
ln -sf /usr/share/zoneinfo/EST /etc/localtime
dpkg-reconfigure --frontend noninteractive tzdata
```

On Ubuntu 22.04 (jammy) convert_timezone() in tzdata.config maps EST to
America/Indianapolis which is a symlink to America/Indiana/Indianapolis.
Bug 1: America/Indianapolis is not an option in debconf and therefore
the first geographic area "Adak" is used.

Possible bug 2: convert_timezone() in tzdata.config maps EST to
America/Indiana/Indianapolis, but EST is not a symlink to
America/Indiana/Indianapolis. If I saw that correctly, EST does not take
daylight saving into account.

** Summary changed:

- timezone changed unexpectedly from EST to America/Adak
+ timezone changed unexpectedly from EST to America/Adak or America/Indiana/Indianapolis

** Changed in: tzdata (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/2055718

Title:
  timezone changed unexpectedly from EST to America/Adak or
  America/Indiana/Indianapolis

Status in tzdata package in Ubuntu:
  Triaged

Bug description:
  A user reported this regression on
  https://bugs.launchpad.net/ubuntu/+source/tzdata/+bug/2052739:

  UPDATE: I don't think it's a regression anymore, see comment #5

  """
  Hello.
  After automatic upgrade of tzdata from 2023c-0ubuntu0.22.04.2 to 2024a-0ubuntu0.22.04
  the previously set EST time zone was automatically changed to "America/Adak" or "America/Indiana/Indianapolis" on all our servers (50+).
  Look like a bug in tzdata configure script.
  """

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