To install Ubooquity at DNS-320:

http://dlink.vtverdohleb.org.ua/Add-On/#Ubooquity327L/DNS-327L%20Ubooquity%20Package%20v1.00_09112015

Previously you have to install Java7:

http://dlink.vtverdohleb.org.ua/Add-On/current.php?package=java7&hash=9b6dad0e9f635809f7e5697a894be04d&model=DNS-320L