Public bug reported:

[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.

** Affects: gnupg2 (Ubuntu)
     Importance: Undecided
         Status: Fix Committed

** Affects: gnupg2 (Ubuntu Noble)
     Importance: Undecided
         Status: New

** Affects: gnupg2 (Ubuntu Oracular)
     Importance: Undecided
         Status: New

** Affects: gnupg2 (Ubuntu Plucky)
     Importance: Undecided
         Status: Fix Committed

** Also affects: gnupg2 (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: gnupg2 (Ubuntu Oracular)
   Importance: Undecided
       Status: New

** Also affects: gnupg2 (Ubuntu Plucky)
   Importance: Undecided
       Status: New

** Changed in: gnupg2 (Ubuntu Plucky)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/2090995

Title:
  gnupg2 is not OpenPGP compliant

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