debian:Sury:apt:The following signatures couldn't be verified because the public key is not available
分類：Debian
環境: Sury packages on debian 9
apt update output: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://packages.sury.org/php stretch InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B188E2B695BD4743 Failed to fetch https://packages.sury.org/php/dists/stretch/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B188E2B695BD4743 Some index files failed to download. They have been ignored, or old ones used instead.
發生原因為 https://packages.sury.org/ 的 apt.gpg 於 18-Mar-2019 更新
解決方法
wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
再重新執行
apt update