I think Ubuntu is set by default to use pulse audio driver. How do I change to OSS? Some softwares that I am using only allow this type of sound driver to use corectly the sound system. Thank you for any advice.
Ubuntu has deprecated OSS support - the kernel no longer supports OSS devices.
For legacy apps that insist on using a OSS device, you should look at using
If application foo needs to use OSS devices, simply run:
It will emulate /dev/dsp and related devices, and redirect data between foo and these devices to PulseAudio.