You can see more details and the latest version of the tool here: http://dev.mysql.com/downloads/repo/apt/

wget https://dev.mysql.com/get/mysql-apt-config_0.8.9-1_all.deb

sudo dpkg -i mysql-apt-config_0.8.9-1_all.deb

You will be asked to select product and version that you want to install.

In the first step, select Server and next select either mysql-5.6 or mysql-5.7. Then click Apply.

sudo apt update

sudo apt install mysql-community-server