Looking at Oracle 18c
After getting the database code trees installed I went on to the dbca creation

I saw there was a log directory for dbca creations

/u01/app/oracle/cfgtoollogs/dbca

The logs are listed in groups of (2)
starting with trace and silent

many failed attempts, but this is a good place to start to get the problems solved.
Currently we have a situation that the create failed due to ASM checks

Not sure why this is occurring as the ASM disks are up and available

You can use dbca to create ASM or database instances from the command line:

dbca -silent  -createDatabase  -templatename <template name> -gdbName <global database name>

-silent will prevent the GUI from appearing 
-templatename specifies a template in the $oracle_home/assistants/dbca/template directory

Using the DBCA to Delete a Database

To delete (or configure) a database in UNIX or Linux, you must set ORACLE_SID in the shell from which DBCA is launched. Start the DBCA by entering dbca in a terminal window, and click Next on the Welcome page. to delete the database, perform the following steps:

  1. On the Operations page, select Delete a Database, and click Next.
  2. Select the database that you wanted to delete (in class, hist), and click Finish.
  3. Click Yes to confirm your deletion.

Dropping a database involves removing its data files, redo log files, control files, and initialization parameter files. The DROP DATABASE statement deletes all control files and all other database files listed in the control file. To use the DROP DATABASE statement successfully, all the following conditions must apply:

An example of this statement is:

DROP DATABASE;

The DROP DATABASE statement has no effect on archieved log files nor does it have any effect on copies or backups of the database. It is best to use Recovery Manager (RMAN) to delete such files. If the database is on raw disks, then the actual raw disk special files are not deleted.

 

DBCA Stuff

DBCA 12.2

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