E: Unable to locate package

[okobloko]

When trying to build, I get the following errors :
E: Unable to locate package php7.0-mysql
E: Couldn't find any package by glob 'php7.0-mysql'
E: Couldn't find any package by regex 'php7.0-mysql'
E: Unable to locate package libapache2-mod-php7.0
E: Couldn't find any package by glob 'libapache2-mod-php7.0'
E: Couldn't find any package by regex 'libapache2-mod-php7.0'
E: Package 'lynx-cur' has no installation candidate
E: Unable to locate package php7.0-xml
E: Couldn't find any package by glob 'php7.0-xml'
E: Couldn't find any package by regex 'php7.0-xml'
ERROR: Service 'sendy' failed to build: The command '/bin/sh -c apt-get update && apt-get -y upgrade && DEBIAN_FRONTEND=noninteractive apt-get -y install apache2 php7.0 mysql-client php7.0-mysql libapache2-mod-php7.0 php-curl curl lynx-cur php7.0-xml cron' returned a non-zero code: 100

[okobloko]

Without wanting to get sucked in too deep, I found that altering the Dockerfile to use "FROM ubuntu:xenial" did the trick.