I subscribed to the fish-shell mailing list quite a while ago (https://sourceforge.net/projects/fish/lists/fish-users ) and frequently get
e-mails from the developer and maintainers.
On Feb 13 2020 I got an e-mail from David Adam which contained a PGP signed message together with the PGP signature.
I use thunderbird with enigmail and imported his public key. Furthermore I signed the key as I trust David Adam.
He had sent me the fingerprint before.
For the signing I used seahorse (GNOME front end for GnuPG) and checked “I want to be able to revoke the signature at another point in time”.
Nevertheless revoking doesn´t work (tab “trust”) because the button “revoke signature” is greyed out.
Does anybody know something about this?
Thanks a lot in advance.