You can use the debug option if additional debugging is necessary for troubleshooting.
This results in a very verbose execution that contains state change information and call stack details and other background call details to assist with debugging certain issues.
To enable or disable debugging you can search for the DEBUG parameter variable within the script and toggle the following parameter when creating or recreating the IN_DB_UTIL and/or the IN_DB_UPGRADE packages.
DEBUG VARCHAR2(3) := UPPER('YES'); -- Enable debugging output during execution
DEBUG VARCHAR2(3) := UPPER('NO'); -- Disable debugging output during execution