Re: Failure getting compat on Emacs <29. seq.2.24 signature expired in gnu elpa?

[Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

> Failed to verify signature seq-2.24.tar.sig:
> No public key for 645357D2883A0966 created at 2024-03-31T05:55:14-0400
> using (unknown algorithm 22)
> Signature made by expired key 066DAFCB81E42C40 GNU ELPA Signing Agent
> (2019) <elpasign@elpa.gnu.org>
> Command output:
> gpg: Signature made Sun 31 Mar 05:55:14 2024 EDT
> gpg:                using RSA key C433554766D3DDC64221BFAA066DAFCB81E42C40
> gpg: Good signature from "GNU ELPA Signing Agent (2019) <
> elpasign@elpa.gnu.org>" [expired]
> gpg: Note: This key has expired!
> Primary key fingerprint: C433 5547 66D3 DDC6 4221  BFAA 066D AFCB 81E4 2C40
> gpg: Signature made Sun 31 Mar 05:55:14 2024 EDT
> gpg:                using EDDSA key 0327BE68D64D9A1A66859F15645357D2883A0966
> gpg: Can't check signature: No public key
>
> Has someone submitted a signed package without publishing its public key or
> is this something wrong on my end?

You have the 2019 GNU ELPA signing key, but that one is expired.
(No)GNU ELPA packages are now signed with the 2022 key (distributed with
Emacs≥29 as well as in the `gnu-elpa-keyring-update` package).
The simplest is likely to install the `gnu-elpa-keyring-update` package,
but you may have to either disable signature checking temporarily,
or manually extent the lifetime of the 2019 key.


        Stefan