Bureaucrats, confirmed, Administrators
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# put site in operation mode<code>drush vset maintenance_mode 0</code>
# toast
Note that in the event that you get errors, you may need to clear the cache:<code>sudo -u www-data drush cache-clear civicrm</code>
The even shorter version is to use [[drush]] <code>civicrm-upgrade --tarfile=./sites/all/modules/contrib/civicrm-5.1.2-drupal.tar.gz --backup-dir=/tmp/</code> does all the above for you.