[64 bit] No Sound, No Alsamixer for Ubuntu 13.04

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http://ubuntuforums.org – (Just a fair warning, I've only just been using ubuntu 12.10 as a os where I can't fool around like windows (gaming etc) so I don't know much about programming) I've only been using Ubuntu 12.10 for my work which was perfectly fine, sound ok everything until I upgraded. At first, the upgrade said it was sucessful but when I decided to go on youtube to listen to some tunes it didn't work (tried with headphones and speakers). I then swapped to Windows 8 to see if something happened to it but it was working there. I did have a look around other sites but for some reason when I type alsamixer in (Hardware)