1. You must download libstdc++ manually because this package is not included in the Ubuntu repositories. Don't worry, you can use these .deb files:
2. Add the SopCast Player PPA and install SopCast Player:
sudo add-apt-repository ppa:ferramroberto/extra && sudo apt-get update
sudo apt-get install sopcast-player sp-auth
And that's it, now go to Applications > Sound & Video > SopCast Player.