I have checked to see if my onboard analog audio is what is being recognized by ubuntu and it isn't. I recently installed a new nvidia graphics card and the audio is being recognized as that instead of my onboard audio. I don't know how to change it so that my speakers plugged into my computer will work. I have also tried reinstalling ubuntu and that didn't help, I tried to find drivers for the onboard audio and that didn't work either. The onboard audio is an intel adi1884 and my gpu is a nvidia gt 440.