Building docker image produce php issues

Hello every one,
I have an issue concerning php:5.6-apache ,
My OS: ubuntu 14.04-server
this is my Dockerfile looks like:

FROM php:5.6-apache
MAINTAINER name <name.com>
LABEL version="1.0"
LABEL description="Apache 2 / PHP"
RUN apt-get update -y \
&& apt-get install -y \
    libmcrypt-dev \
    git \
    zip unzip \
    libicu-dev \
    zlib1g-dev \
    php5 \
    php5-fpm \
    php5-pear \
    php5-dev \
    php5-apc \
    php5-common \
    php5-json \
    php5-memcache \
    php5-memcached  \
    php5-xsl \
    php5-mcrypt \
    php5-mysql \
    php5-cli \
    php5-gd \
    php5-intl \
    php5-curl \
&& docker-php-ext-install -j$(nproc) pdo_mysql mysql mysqli iconv mcrypt opcache

This is the error that i have:

 E: Package 'php5' has no installation candidate
 E: Package 'php5-fpm' has no installation candidate
 E: Package 'php-pear' has no installation candidate
 E: Package 'php5-dev' has no installation candidate
 E: Package 'php-apc' has no installation candidate
 E: Package 'php5-common' has no installation candidate
 E: Package 'php5-json' has no installation candidate
 E: Package 'php5-memcache' has no installation candidate
 E: Package 'php5-memcached' has no installation candidate
 E: Package 'php5-xsl' has no installation candidate
 E: Package 'php5-mcrypt' has no installation candidate
 E: Package 'php5-mysql' has no installation candidate
 E: Package 'php5-cli' has no installation candidate
 E: Package 'php5-gd' has no installation candidate
 E: Package 'php5-intl' has no installation candidate
 E: Package 'php5-curl' has no installation candidate

I followed this Link :https://stackoverflow.com/questions/40567133/cannot-add-ppa-ppaondrej-php5-5-6

But there is no result.
Thank you.