Ubuntu 13.04 64-bit, OpenLP installed via terminal using (root):
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<font face="Arial, sans-serif"><font style="font-size: 11pt" size="2"><font color="#ff0000">add-apt-repository ppa:openlp-core/release && apt-get update && apt-get install openlp </font><font color="#ff0000">python-uno<br><br><font color="#000000">Recognizes Impress 4 and functions correctly.<br><br>Ubuntu-Gnome 13.04 already includes python-uno and correctly recognizes Impress 4, OOTB. <br></font></font></font></font>