Well only has three input jacks on this old PC, Line-in, Line-out and Mic.
Got on line and verified the symbols on the back are as I interpreted
them. The software preferences have all kinds of settings, so I went to
my music folder and clicked on some music and played with the options
until I got music out of the speakers.
I have downloaded Debian and got it loaded on that PC, and loaded the
software that is controlling the receiver and have the line in as before and
I get sound out of the speaker without any fiddling with the settings.
So I think there is a problem with the Ubuntu 10.04, 10.10 sound settings.
I am still going to play with the laptop and plug it in running 10.04 to
see
if I can find out what is missing. I do have a clue, it may need ALSA Mixer
downloaded and installed. The Debian load has it as the sound control
and I don't see it in the Ubuntu load.