drush dl views_slideshow

 [notice] Project views_slideshow (8.x-4.0) downloaded to /opt/lampp/htdocs/mysites1//modules/views_slideshow.
Project views_slideshow contains 2 modules: views_slideshow_cycle, views_slideshow.

drush en views_slideshow

 [error]  Command pm-enable needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command.
 [error]  The drush command 'en views_slideshow' could not be executed.
 [error]  Drush was not able to start (bootstrap) the Drupal database.
Hint: This may occur when Drush is trying to:
 * bootstrap a site that has not been installed or does not have a configured database. In this case you can select another site with a working database setup by specifying the URI to use with the --uri parameter on the command line. See `drush topic docs-aliases` for details.
 * connect the database through a socket. The socket file may be wrong or the php-cli may have no access to it in a jailed shell. See http://drupal.org/node/1428638 for details.

Drush was attempting to connect to:
 Drupal version         :  8.1.3
 Site URI               :  http://default
 Database driver        :  mysql
 Database hostname      :  localhost
 Database port          :  3306
 Database username      :  root
 Database name          :  mysites1
 PHP configuration      :  /etc/php/php.ini
 PHP OS                 :  Linux
 Drush script           :  /usr/share/webapps/drush/drush.phar
 Drush version          :  9.0-dev
 Drush temp directory   :  /tmp
 Drush configuration    :
 Drush alias files      :  /etc/drush/aliases.drushrc.php
 Drupal root            :  /opt/lampp/htdocs/mysites1
 Drupal Settings File   :  sites/default/settings.php
 Site path              :  sites/default
 Sync config path       :  sites/default/files/config_0zmvrOOK_1FYr
                           vFphuxQwHH9zoW8Owkih_fBfP2q2DefAJn1x2IyC
                           2lFI2CWr0o5GxT7whTc1g/sync