[texworks] 'No SyncTex data available', Xunbuntu 9.10, TeXWorks 0.3 ver 571

[Paul A Norman]

I'm currently setting up an Xunbuntu 9.10 box, using TeXWorks 0.3 ver
571 installed after adding ppa:texworks/ppa. (0.3.0~svn581~karmic1
Stefan Löffler  (2010-04-02) )

This document trial was done using the built in template for article
with small safe modifications.

When the typesetting has finished the document correctly shows in the
preview pane and a message briefly appears in the preview frame's
footer panel saying that there is 'No SyncTex data available', and so
of course none of the 'Jump to ..' work

Do I need to install something else or ...?

Paul