A simple way to run multiple Drush versions on the same server.
Download the drush.phar file. Rename the file to drush. Make it executable and move it to any folder that is in your PATH.
wget https://github.com/Chi-teck/multi-drush/releases/download/1.1.0/drush.phar
chmod +x drush.phar
sudo mv drush.phar /usr/local/bin/drushCore conversation: https://www.drupal.org/node/2874827