Retry again with:
ldapdelete -x -D "cn=admin,$(ucr get ldap/base)" -y /etc/ldap.secret "cn=guacamole,cn=udm_syntax,cn=univention,dc=ldi,dc=intranet"
ldapdelete -x -D "cn=admin,$(ucr get ldap/base)" -y /etc/ldap.secret "cn=guacamole/config,cn=udm_module,cn=univention,dc=ldi,dc=intranet"