How did I fix «Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg)»?

Unix Debian
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2023-10-17--08-36-14

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for KEY in $(apt-key --keyring /etc/apt/trusted.gpg list | grep -E "(([ ]{1,2}(([0-9A-F]{4}))){10})" | tr -d " " | grep -E "([0-9A-F]){8}\b" ); do K=${KEY:(-8)}; apt-key export $K | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/imported-from-trusted-gpg-$K.gpg; done

askubuntu.com/a/1415702