APT fails: NO_PUBKEY
Ever get an error like this when running an apt update? The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B4D2D216F1FD7806 or W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://download.jitsi.org stable/ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B4D2D216F1FD7806 W: Failed to fetch https://download....