Bootstrap level error When I attempt to use Drush 8.0.3 on a clean Drupal 8.1.1 install, I receive the following error:


  Command pm-list needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command.


This is on a Digital Ocean server running Ubuntu and nginx.

Drush status:

root@*********:/var/www/html/drupal/sites/default# drush status 
Drupal version         :  8.1.1                                       
Site URI               :  http://default                              
Database driver        :  mysql                                       
Database hostname      :  localhost                                   
Database port          :                                              
Database username      :  drupal                                      
Database name          :  drupal                                      
PHP configuration      :  /etc/php5/cli/php.ini                       
PHP OS                 :  Linux                                       
Drush script           :  /usr/local/bin/drush                        
Drush version          :  8.0.3                                       
Drush temp directory   :  /tmp                                        
Drush configuration    :                                              
Drush alias files      :                                              
Drupal root            :  /var/www/html/drupal                        
Drupal Settings File   :  sites/default/settings.php                  
Site path              :  sites/default                               
Sync config path       :  sites/default/files/config_JYMyTTYRsOD-Wxu0fI7lfugHI6rk2DbhO5g-jrfjsPyy46mmesB1aTpSuq2RAUIOUC4N2q_IkQ/sync                                                                 


Oddly (to me, at least) I can clear caches:

root@***************:/var/www/html/drupal/sites/default# drush cr
Cache rebuild complete.
I don't know if this always is needed, but I recommended keeping Drush in sync with Drupal - the same version or newer. The current (stable) version of Drush is 8.1.2.