Creating a site with Drush doesn't work Trying to install Drupal 8 using drush.

drush dl drupal --drupal-project-rename=example
cd example


So far, so good.

However, when I get to this part:

drush site-install standard --db-url='mysql://root:my+Password@localhost/db_name' --site-name=Example


I've also tried:

drush site-install standard --db-url='mysql://root:my+Password@127.0.0.1/db_name' --site-name=Example


But I get the following error:


  Failed to connect to your database server. The server reports the following message: SQLSTATE[HY000] [1045] Access denied for user root@localhost (using
      password: YES) Is the database server running? Does the database exist or does the database user have sufficient privileges to create the
      database? Have you entered the correct database name? Have you entered the correct username and password? Have you entered the correct database hostname?


All of the answers are "Yes," so the install should work. Is it something wrong with my syntax? I have other Drupal sites on this server that I've installed manually, it's just the Drush install I can't get to work. What am I doing wrong?
It is probably because you do not have a setting for the super user (user/1). You need to set the account user name and password, so you can login to Drupal. 

drush site-install standard --account-name=admin --account-pass=12345 --db-url=mysql://dbusername:dbpass@localhost/db_name --site-name=Example