8 – Install Drush 9 with Composer

Execute this command (it has no errors):

Global composer requires drush / drush: 9. *

So CD to /var/www/site.com/htdocs/ and run drunkenness, gives:

-bash: / usr / local / bin / drush: there is no such file or directory.

I can not find any documentation that covers this. Each documentation only has that first command to execute and that's it, there is no debugging, nothing.

Ubuntu 18.04, Drupal 8.