How to Install Drush on Ubuntu ?
- Create a symbolic link between Composer's local bin directory, /usr/local/bin/composer , and the system's bin directory, /usr/bin/ : sudo ln -s /usr/local/bin/composer /usr/bin/composer.
- Change the working directory to the new Drush directory: cd /usr/local/src/drush.
https://ibmimedia.com/blog/190/install-drush-on-ubuntu
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