Instalando o cliente mysql 5.6 no Ubuntu

Instalando o cliente mysql 5.6 no Ubuntu

Estou tentando instalar o mysql 5.6 em um servidor Ubuntu 16.04. Entendo que os pacotes disponíveis para mysql são da versão 5.7 mas para instalar a 5.6 fiz os seguintes passos

RUN rm -rf /var/lib/apt/lists/*
RUN apt-get update -y
RUN apt-get upgrade --fix-missing -y
RUN apt-get clean 
RUN apt-get install software-properties-common -y
RUN add-apt-repository 'deb http://archive.ubuntu.com/ubuntu trusty universe'
RUN apt install mysql-client-5.6 -y

Isso ainda dá o seguinte erro

137958 [INFO] Package mysql-client-5.6 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  mysql-testsuite-5.7 mariadb-server-core-10.0 mariadb-client-10.0
  mysql-server-core-5.7 mysql-client-5.7
137963 [INFO] [91mE: Package 'mysql-client-5.6' has no installation candidate

Qual é o repositório correto para instalar?

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