Error upgrade the DigitalOcean One-Click Drupal Image of drupal8
I created a new Ubuntu Drupal 8.1.3 on 14.04,But I want to drupal upgrade 8.2.5.
drush up drupal
root@drupal-512mb-sfo2-01:/var/www/html/drupal/sites/default# drush up drupal Command pm-update needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environmen to run this command. The drush command 'up drupal' could not be executed. 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 : 127.0.0.1 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 : 8.1.2 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_zWDi3fOuGc5C_D6ebw8cglPgBBXQJRq5Aznm2bexOjgdUTFATTXRQY-BHxerNyJBiq3ucYBh4 Q/sync