Hi @sparkles,
we no longer have a default keyserver configured for the installations. Only a search for keys with mail addresses is enabled by default via WKD.
You have two possibilities for importing the key:
- Open a terminal (cmd.exe on Windows) and enter the command provided by the Linux Mint website.
or - Configure the keyserver in Kleopatra (Settings → configure Kleopatra → directory services). After that the search will find it via the fingerprint.