drupal 8

Make sure you have Composer installed.

cd ~
composer global require drupal/console:@stable

There are some new drush Drupal 8 commands that are critical to updating your site. The big new one here, is "drush entitity-updates".  Which should be initiated AFTER "drush updb".

Otherwise, if you check your Drupal 8 "Status Report" you may get an error showing "Entity/field definitions: Mismatched entity and/or field definitions"--which won't be apparent, unless you check the Status Report.

So here goes... 

Clear all cashes (no longer "drush cc all"):

drush cr 

or 

drush cache-rebuild

Update the database (this is still the same, however, you won't be done here):

drush updb

After running "drush updb", you should next run entity updates command:

drush entup

or