Sound in Flash Not Working Under Ubuntu

If you have sound working under Ubuntu everywhere else but inside of Flash videos and games, then you should try the following:

sudo apt-get install libflashsupport

Make sure pulseaudio is running.

Finally, make sure Alsa is properly configured. Edit /etc/asound.conf and make it look like this:
pcm.pulse {
type pulse
}
ctl.pulse {
type pulse
}
pcm.!default {
type pulse
}
ctl.!default {
type pulse
}