Instalación de MySQL server 8.0 en Ubuntu 18.04 LTS «bionic»

Step 1: Add MySQL Apt Repository

wget -c https://repo.mysql.com//mysql-apt-config_0.8.13-1_all.deb
sudo dpkg -i mysql-apt-config_0.8.13-1_all.deb

Step 2: Install MySQL Server in Ubuntu 18.04

sudo apt update
sudo apt-get install mysql-server

More info:

How to Install MySQL 8.0 in Ubuntu 18.04

MySQL Community Downloads