Upgraded to Ubuntu 8.04 - now no sound!

view full story

http://www.ubuntux.org – Hello I installed ubuntu 8.04 yesterday and all was ok but when I went to listen to some videos via Youtube- I don't have any sound for playbacks. I kept getting an error message (which I can't remember now) about Gstreamer plugins so I went to Package Manager to reinstall but still no luck I have installed Volume Applet 2.22.2 and PulseAudio but still no joy I have no knowledge or experience of Linux and Ubuntu - so please explain as if I was 5 years old! What can I do? Really, really appreciate any advice - should I take the Volume and PulseAudio off? Thanks Mabel (Distributions)