No sound problem

[itsmathias]

For some reason I have no sound on youtube for exemple and in VLC , but it works for MPlayer movie player. is there any way to fix this?

[itsmathias]

I tried this:
sudo apt-get install flashplugin-nonfree
sudo update-flashplugin


Restart Mozilla Firefox

Note: if sound doesn't work in Flash Player (for example on YouTube):
sudo apt-get install alsa-oss
gksudo gedit /etc/firefox/firefoxrc
Change:
FIREFOX_DSP=""
To:
FIREFOX_DSP="aoss"

But for some reason I don't have the firefoxrc, so it didn't work