1. Install mplayer (Ubuntu Software Center)
2. Download the following and click to install:
https://launchpad.net/~cnav/+archive/ppa/+files/ppstream_1.0.0-3lucid2_amd64.deb
For Ubuntu 32bit, you can download from PPS website:
http://dl.pps.tv/pps_linux_download.html
or a modified version attached here.
See also:
http://thanhsiang.org/faqing/node/123
To install Sopcast Player, see this page:
http://code.google.com/p/sopcast-player/wiki/Installation