First create the instance:
Create instance --> Linux/Unix --> OS Only --> Ubuntu 16.04 LTS
Wait a few minutes, then open a shell prompt.
sudo apt-get upgrade
sudo reboot
sudo apt-get update
sudo apt-get upgrade
sudo apt autoremove
sudo apt-get dist-upgrade
sudo reboot
sudo apt-get update
sudo apt-get upgrade
Nicely patched now.
To install mysql:
sudo apt-get install mysql-server
mysql_secure_installation
Now to test it:
mysql -u root -p
show databases;