[Bug 1909698] Re: new upstream release 2020f

[Steve Beattie]

Hi Brian,

Thanks for the trusty and precise debdiffs. I have gone ahead and
published the updates to trusty-esm and precise-esm, after verifying the
fixes.

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https://bugs.launchpad.net/bugs/1909698

Title:
  new upstream release 2020f

Status in tzdata package in Ubuntu:
  Fix Released
Status in tzdata source package in Xenial:
  Fix Released
Status in tzdata source package in Bionic:
  Fix Released
Status in tzdata source package in Focal:
  Fix Released
Status in tzdata source package in Groovy:
  Fix Released

Bug description:
  New upstream version, affecting the following timestamp:
    - Volgograd switches to Moscow time on 2020-12-27 at 02:00.

  The ICU timezone data has not yet been updated upstream so those
  changes will be included in a later SRU.

  Verification is done with 'zdump'. The first timezone that gets
  changed in the updated package is dumped with "zdump -v
  $region/$timezone_that_changed" (this needed to be greped for in
  /usr/share/zoneinfo/). [For example: "zdump -v Africa/Casablanca".]
  This is compared to the same output after the updated package got
  installed. If those are different the verification is considered done.

  $region/$timezone = Europe/Volgograd

  Additionally, an upstream update of tzdata removed the "old" SystemV
  timezones, so we should ensure that they are kept in Ubuntu 20.04 LTS
  and earlier releases. Subsequently, these should be checked for using
  the following:

  diff <(zdump -v America/Phoenix | cut -d' ' -f2-) <(zdump -v
  SystemV/MST7 | cut -d' ' -f2-)

  Nothing should be returned by the above command.

  [Original Description]
  https://www.iana.org/time-zones tzdata 2020f already exists, please update the package.

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