ウチのUbuntu 22.04のサーバで以下のエラーメッセージが出ました。
An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://pkg.jenkins.io/debian-stable binary/ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5BA31D57EF5975CA
... "JenkinsのアップデートでAn error occurred during the signature verificationが出た" を続けて読む