sudo cp /etc/apt/trusted.gpg /etc/apt/trusted.gpg.d
=> fixed
src: https://stupidly-honest.tistory.com/26
apt-get update gpg key 에러 해결하기(solved)
에러 내용 방법 1 1. apt-key list 확인 가지고 있는 key를 확인합니다. sion@sion:/etc/apt$ apt-key list Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)). /etc/apt/trusted.gpg -------------------
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W: https://repo.mongodb.org/apt/ubuntu/dists/focal/mongodb-org/5.0/Release.gpg: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.