[Bug 1798073] Update Released

[Brian Murray]

The verification of the Stable Release Update for ubuntu-keyring has
completed successfully and the package has now been released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1798073

Title:
  [SRU] Provide 2018 archive signing key on stable releases

Status in ubuntu-keyring package in Ubuntu:
  Fix Released
Status in ubuntu-keyring source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * For LTS releases to be able to bootstrap dual and single signed
  future releases, and validate all signatures, 2018 archive signing key
  should be SRUed back

   * Also build process has improved documentation and vague validation
  that all key snippets are signed correctly

  [Test Case]

   * $ apt-key list
  ...
  /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg
  ------------------------------------------------------
  pub   rsa4096 2018-09-17 [SC]
        F6EC B376 2474 EDA9 D21B  7022 8719 20D1 991B C93C
  uid           [ unknown] Ubuntu Archive Automatic Signing Key (2018) <ftpmaster at ubuntu.com>
  ...

  apt-key list should contain the 2018 archive key.

  [Regression Potential]

   * Build-process, key algo, and key size, and file format are the same
  as previous key snippets thus supported by all of gpg1 gpg2 gpgv1
  gpgv2.

  [Other Info]

   * 2018 key is to be used for dual-signing in DD series and up

   * Bileto PPA is built against security pocket only, suitable to be
  released into both -security and -updates

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