How to solve ORA-65035: unable to create pluggable database from PDB$SEED

The error means:

oerr ora 65035
65035, 00000, "unable to create pluggable database from %s"
// *Cause:  An attempt was made to clone a pluggable database that did not have
//          local undo enabled.
// *Action: Enable local undo for the PDB and and retry the operation.

So let's do that: add local undo to our CDB, so that we can create new PDBs from the PDB$SEED container:

SYS@cdb01>SQL>show con_name

CON_NAME
------------------------------
CDB$ROOT

SYS@cdb01>SQL>alter database local undo on;
alter database local undo on
*
ERROR at line 1:
ORA-65192: database must be in UPGRADE mode for this operation

SYS@cdb01>SQL>shutdown
SYS@cdb01>SQL>startup upgrade
SYS@cdb01>SQL>ALTER DATABASE LOCAL UNDO ON;

Database altered.

SYS@cdb01>SQL>shutdown immediate
SYS@cdb01>SQL>startup

Verify that local undo is enabled:

column property_name format a30
column property_value format a30

select property_name, property_value
from   database_properties
where  property_name = 'LOCAL_UNDO_ENABLED';

PROPERTY_NAME                  PROPERTY_VALUE
------------------------------ ------------------------------
LOCAL_UNDO_ENABLED             TRUE

You can now create your PDB:

 SYS@cdb01>SQL>create pluggable database veg1 admin user pdbadmin identified by mypassword file_name_convert=('/data/pdbseed','/data/veg1');

Pluggable database created.