Ocsagent 2.4.2 shows no OS version in Ubuntu 18.04

In ocsreports, All computers page, only "Ubuntu" is shown, without OS Version. The ocs agent was Installed from sources.

Lines registered in ocsinventory-agent.log:

    <HARDWARE>
      ....
      <OSNAME>Ubuntu</OSNAME>
      <OSVERSION>18.04</OSVERSION>
      ....
    </HARDWARE>