FIX: Signature verification error while running apt-get update

apt-get update signature verification error

You may encounter an error when running apt-get update on your Debian / Ubuntu based Linux server:

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Reading package lists... Done
W: 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 jessie InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B188E2B695BD4743

W: Failed to fetch https://packages.sury.org/php/dists/jessie/InRelease

W: Some index files failed to download. They have been ignored, or old ones used instead.

This repository is maintained by Ondrej to host his PHP Debian / UbuntuĀ  Packages.

In order to resolve the error and successfully fetch the updated list you should simply add the new APT GPG signing-key to your trusted keyring by running the following CLI commands:

sudo apt-get -y install apt-transport-https lsb-release ca-certificates

sudo wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg

sudo sh -c 'echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'
sudo apt-get update

Alternatively you could run Ondrej’s bash script:
https://packages.sury.org/php/README.txt

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