Merge pull request #80 from mantlecurve/patch-1

updated the document to include `dbtype` in dbconfig

Author: jespino

website/site/content/download/personal-edition/ubuntu.md

@@ -143,6 +143,7 @@ nano /opt/focalboard/config.json
 
 Change the dbconfig setting to use the postgres database you created:
 ```
+"dbtype": "postgres",
 "dbconfig": "postgres://boardsuser:boardsuser-password@localhost/boards?sslmode=disable&connect_timeout=10",
 ```