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Building from Dockerfile and getting "The following signatures couldn't be verified because the public key is not available: NO_PUBKEY" – Debian

I'm trying to build a PHP 5.3/Apache for local use using a Dockerfile that starts: FROM php:5.3-apache RUN apt-get update && apt-get install -y libfreetype6-dev libjpeg62-turbo-dev libmcrypt-dev libpng-dev But when "Reading package lists" I get: W: GPG error: http://security.debian.org jessie/updates…

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