I can't speak to compatibility between LO and PPT, how's this for a shot in the dark: Record it with RecordMyDesktop, then pass the video file to him. You can tell RecordMyDesktop to record the entire screen, a portion of the screen, or a specific window.
If I remember correctly, I think RecordMyDesktop records in ogg-vorbis format, but you can convert it with ffmpeg or mencoder. RecordMyDesktop should be in the Ubuntu repos.
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