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[Launchpad Bug Tracker <1645906@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-release-upgrader - 1:16.04.19

---------------
ubuntu-release-upgrader (1:16.04.19) xenial; urgency=medium

  * No change rebuild so the dist-upgrader tarball will be signed with the new
    method. (LP: #1645906)

 -- Brian Murray <brian@xxxxxxxxxx>  Wed, 30 Nov 2016 08:26:54 -0800

** Changed in: ubuntu-release-upgrader (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Changed in: ubuntu-release-upgrader (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1645906

Title:
  new dist-upgrader tarballs necessary so they are signed with 4k key

Status in ubuntu-release-upgrader package in Ubuntu:
  New
Status in update-manager package in Ubuntu:
  Invalid
Status in update-manager source package in Precise:
  Fix Released
Status in ubuntu-release-upgrader source package in Trusty:
  Fix Released
Status in update-manager source package in Trusty:
  Invalid
Status in ubuntu-release-upgrader source package in Xenial:
  Fix Released
Status in update-manager source package in Xenial:
  Invalid
Status in ubuntu-release-upgrader source package in Yakkety:
  Fix Released
Status in update-manager source package in Yakkety:
  Invalid

Bug description:
  With the ubuntu-archive-publishing change in
  https://code.launchpad.net/~xnox/ubuntu-archive-publishing/migrate-
  dist-upgrade-to-4k/+merge/311181 the signing process for the dist-
  upgrader tarball has been changed.  This change should be tested now,
  rather than doing an ubuntu-release-upgrader change months from now
  and wondering why things aren't working (if they are broken).

  Due to the way the gpg signature is generated we can't just remove it
  and have it regenerated as the timestamp for the signature will not
  change, so the change will not propogate to the mirrors.  Hence the
  need for a mostly no change (mirrors and demotions may change) upload
  of ubuntu-release-upgrader.

  Test Case
  ---------
  1) run do-release-upgrade -p --frontend DistUpgradeViewText
  2) ensure the tarball for the next release e.g. xenial.tar.gz is downloaded and the signature verification passes

  Regression Potential
  --------------------
  It's possible the signing is wrong and the verification of the signature will fail thereby causing release upgrades to be impossible.

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