Linux Signature Verification failed for Linux download ??

[pthire]

Maybe I'm making a mistake, but it seems that the Linux Signature Verification failed. I download Linux Desktop Version from this page : https://specter.solutions/downloads/ I follow instructions to verify signature and I got that :

gpg --list-keys /home/moi/.gnupg/pubring.kbx

pub rsa4096 2020-01-11 [SC] [expire : 2036-01-07] ECC0B4ABD74E716F5ADE095228B358A8843B0109 uid [ inconnue] Kim Neunert [email protected] sub rsa4096 2020-01-11 [E] [expire : 2036-01-07] sub rsa4096 2020-11-25 [S]

gpg --verify SHA256SUMS.asc gpg: signed data is supposed to be in "SHA256SUMS". gpg: Signature made on Thu. May 30, 2024 20:42:49 CEST gpg: with RSA key 785A2269EE3A9736AC1A4F4C864B7CF9A811FEF7 gpg: Unable to verify signature: No public key

mistake on my part ? corrupted site ?

I work on Debian 6.1.90-1 (2024-05-03) x86_64.