Mysql 5.6 isn't supported on ubuntu 18.04 version

sudo add-apt-repository 'deb http://archive.ubuntu.com/ubuntu trusty universe'
sudo apt-get update
sudo apt install mysql-server-5.6 mysql-client-5.6
sudo service mysql restart / sudo /etc/init.d/mysql restart
mysql -u root -p

sudo /etc/mysql/mysql.conf.d/mysqld.cnf
Then -> bind-address = 127.0.0.1 to bind-address = 0.0.0.0
sudo systemctl restart mysql.service
sudo apt install mysql-workbench