[Bug 2060721] Re: APT 2.8.0: Promote weak key warnings to errors

[Timo Aaltonen]

this upload is not to be accepted to -updates before the discussion on
ubuntu-release@ is concluded

** Tags added: block-proposed

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Title:
  APT 2.8.0: Promote weak key warnings to errors

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Noble:
  Fix Committed

Bug description:
  ⚠️ Only land this in the release/updates pocket after PPAs have been
  resigned

  (This bumps the apt version to 2.8.0. APT uses the odd/even number
  system, with 2.7.x being the development series for 2.8, and this is
  the only change left for the 2.8 release, safe for some minor
  translation/test suite improvements)

  (Please also look at bug 2073126 for the follow-up changes to mitigate
  regression potential).

  [Impact]
  APT is currently just warning about keys that it should be rejecting to give Launchpad time to resign PPAs. This needs to be bumped to an error such that the crypto policy is fully implemented and we only trust keys that are still being trusted. #2055193

  A warning provides some help right now to third-parties to fix their
  repositories, but it's not *safe*: A repository could have multiple
  signing keys and be signed by a good key now, then later, a previous
  key still in trusted.gpg.d could be revoked and we'd degrade to
  warnings, which, given that we update in the background automatically,
  the user may not see.

  Other fixes:
  - The test suite has been made less flaky in two places
  - Documentation translation has been unfuzzied for URL changes in 2.7.14

  [Test plan]
  The vast regression test suite prevents regression in other components. Additional tests are:

  1. (promotion to error) Take a repository that has a weak RSA key warning, upgrade apt and check that it is an error
  2. (still valid) Check that the main Ubuntu repositories and/or resigned PPAs work correctly.

  We don't have any tests for the test changes or the documentation
  translation URL unfuzzying.

  [Where problems could occur]
  apt will start to fail updates of repositories with weak signing keys, but it will have warned users about that before. Given that it is still early in the cycle, and we only enable updates from 22.04.1 for 24.04.1, this seems the right tradeoff for future security.

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