Fresh install of 16.04 on hardware that ran 14.04 faultlessly. 14.04 has sound, 16.04 not. The problem seems not to be at the driver level: the same drivers (snd_hda_intel, snd_oxygen) are allocated to the same hardware devices as seen whith lshw -C sound. In the sound settings, the output devices are Digital Output (S/PDIF), Analogue Output and Headphones. There is no setting for speakers.
Fresh install of 16.04 on hardware that ran 14.04 faultlessly. 14.04 has sound, 16.04 not. The problem seems not to be at the driver level: the same drivers (snd_hda_intel, snd_oxygen) are allocated to the same hardware devices as seen whith lshw -C sound. In the sound settings, the output devices are Digital Output (S/PDIF), Analogue Output and Headphones. There is no setting for speakers.