trying to upgrade from 7.2.2 on ubuntu 10.04 to 8.0.2 on 12.04. upgraded os first - no probs; apt-get installed libperl5.14, and started installing 8.0.2. it fails trying to migrate ldap data:

512313f9 olcObjectIdentifier: value #1225 olcObjectIdentifier: "zimbraGroup" previously defined ""
512313f9 olcAttributeTypes: value #0 olcAttributeTypes: Duplicate attributeType: "1.2.840.113556.1.2.146"
512313f9 config error processing cn={4}zimbra,cn=schema,cn=config: olcAttributeTypes: Duplicate attributeType: "1.2.840.113556.1.2.146"
slapadd: bad configuration directory!

i've looked around and saw some discussions on empty backups, but it appears that many pieces migrated, something about the 'bad config directory' maybe?