ComputingConfidence

This is because Ubuntu are afraid of probing old style hardware all too rigorously as it might end up crashing.

However this is no big problem, you just ned to load the right module (driver) for your Toshiba Tecra 8000 equipped with Yamaha sound card.  In a terminal do the following:

$ sudo modprobe snd-opl3sa2

In order to load the sound module next time you start:

$ sudo -i
# echo "snd-opl3sa2" >> /etc/modules
# exit
$ exit

That's it, now you can listen and speak to your laptop.