I don't think that command has been part of OpenLDAP for a while. Even if it was, you don't want to run a ldbm backend. Use hdb and the 'slapadd' command to do offline population from LDIF.
I am currently configuring an openldap server on ubuntu-server 8 My question is where to find the command:
to convert my ldiff files to dbm
Thanks in advance,