Thanks - that's easy enough to follow. I've downloaded the 32 bit version and it is as you describe and the shell script is there. The PDF file output now works. The video creation also works provided I keep it short and the size no bigger than 720x540. That'll do for me.
My computer's memory is 1GB so I can't increase the figure in the shell script.
Emmanuel
I have been using Ubuntu Classic with Effects (although they don't work!).