Script level upgrade for database '%1!s!' failed because upgrade step '%2!s!' was aborted before completion. If the abort ...

Script level upgrade for database '%1!s!' failed because upgrade step '%2!s!' was aborted before completion. If the abort happened during upgrade of the 'master' database, it  will prevent the entire SQL Server instance from starting. Examine the previous errorlog entries for errors, take the appropriate corrective actions and re-start the database  so that the script upgrade steps run to completion.