In my particular case the speaker cable on the motherboard was unplugged. Just before to install 16.04 my laptop was updated with a SSD disk and the technician forgot to plug that wire.
However, I see this bug reported in several places. Regards -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573115 Title: No Speakers Sound in Ubuntu 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1573115/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs