[Bug 2079966] Please test proposed package

[Łukasz Zemczak]

Hello Benjamin, or anyone else affected,

Accepted tzdata into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/tzdata/2024b-0ubuntu0.20.04 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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https://bugs.launchpad.net/bugs/2079966

Title:
  tzdata 2024b release

Status in tzdata package in Ubuntu:
  Fix Released
Status in tzdata source package in Focal:
  Fix Committed
Status in tzdata source package in Jammy:
  Fix Committed
Status in tzdata source package in Noble:
  Fix Committed
Status in tzdata source package in Oracular:
  Fix Committed

Bug description:
  [ Impact ]

  The 2024b release contains the following changes:

  * Improve historical data for Mexico, Mongolia, and Portugal.
  * System V names are now obsolescent.
  * The main data form now uses %z.

  [ Test Plan ]

  Test cases were added to the autopkgtest to cover the testing:

  * python: test_2024b
  * python-icu: test_2024b (only for focal and newer)

  So the test plan is to check that the autopkgtest succeeds.

  [ Other Info ]

  The autopkgtest for chrony is flaky on jammy and newer (see bug
  #2002910).

  There are backward-incompatible changes included:

      Names present only for compatibility with UNIX System V
      (last released in the 1990s) have been moved to 'backward'.
      These names, which for post-1970 timestamps mostly just duplicate
      data of geographical names, were confusing downstream uses.
      Names moved to 'backward' are now Links to geographical names if
      there is an exact match since 1970, and remain Zones otherwise.
      Those needing the previous TZDB behavior, which does not match any
      real-world clocks, can find the old entries in 'backzone'.
      (Problem reported by Justin Grant.)

  We need to exclude this change for the SRU since it can/will break
  user setup (e. g. the user from bug #2055718) and it will break a
  handful of tests (including dateparser, pandas, posrtesql-16). See
  https://bugs.debian.org/1084190

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