[Bug 2090995] Re: gnupg2 is not OpenPGP compliant

[Andreas Metzler]

Have you got / are you running tests to doublecheck that revert-
rfc4880bis.patch does what it is supposed to do and continues to do so?

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Title:
  gnupg2 is not OpenPGP compliant

Status in gnupg2 package in Ubuntu:
  Fix Committed
Status in gnupg2 source package in Noble:
  New
Status in gnupg2 source package in Oracular:
  New
Status in gnupg2 source package in Plucky:
  Fix Committed

Bug description:
  [Impact]
  GnuPG 2.4 defaults to generating keys that are incompatible with other OpenPGP implementations, following a schism in the OpenPGP community leading to GnuPG upstream to declare its own LibrePGP "standard".

  We should revert these changes such that keys generated on 24.04 are
  interoperable again.

  [Test Plan]
  TBD

  [Where problems could occur]
  Particularly concerning would be an inability to verify signatures from keys previously generated on 24.04; our test plan should ensure that a v5 key's signatures can still be verified after we switch back to v4 keys by default.

  There are some unknowns in how users might have come to rely on some
  v5-only features that are once again hidden behind an option, like the
  ed448 keys.

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