[Bug 1562733] Re: apt signature requierements prevent updates from some repositories

[Ubuntu Foundations Team Bug Bot]

The attachment "Fix for the AppStream issue, currently in testing" seems
to be a patch.  If it isn't, please remove the "patch" flag from the
attachment, remove the "patch" tag, and if you are a member of the
~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
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** Tags added: patch

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https://bugs.launchpad.net/bugs/1562733

Title:
  apt signature requierements prevent updates from some repositories

Status in appstream package in Ubuntu:
  Triaged
Status in apt package in Ubuntu:
  In Progress

Bug description:
  Since xenial updated the requirements for the strength of PGP
  signatures of packages, packages from some repositories are no longer
  updated. Apt-get update reports these errors:

  E: Failed to fetch http://[...]/Release  No Hash entry in Release file /var/lib/apt/lists/partial/[...] which is considered strong enough for security purposes
  E: Some index files failed to download. They have been ignored, or old ones used instead.

  While the motivation for the change is valid, the result is a
  potential security problem, as the new versions of the packages that
  may fix recently discovered vulnerabilities are not automatically
  installed.

  One less important but unfortunate effect is a scary message that is
  displayed to the user, without clear explanation that the problem
  needs to be addressed by the repository owner.

  Related: Bug #1558331

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