Ubuntu – Ubuntu 16.04 LTS – How to use the integrated Intel ALC268 audio device? Or what is a good work-around

Computer has a generic Intel motherboard with integrated audio ports.

Everything works great except the audio.

Output from the green "headphone" port to the amplifier sounds like a powerline hum as if the input cable is just acting like an antenna.

TROUBLESHOOTING AND INFORMATION GATHERING:

Upon startup, via pressing of F2, was able to verify that audio is enabled in the BIOS.

Then after boot into Ubuntu 16.04 LTS and login, with a terminal window open:

This command

dmidecode | more

shows the Base Motherboard to be Intel DQ35J0

When I type in

aplay -l

I get this:

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0

This command

lspci -v | grep -A7 -i "audio"

gives this:

00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 02)
Subsystem: Intel Corporation 82801I (ICH9 Family) HD Audio Controller
Flags: bus master, fast devsel, latency 0, IRQ 32
Memory at e0420000 (64-bit, non-prefetchable) [size=16K]
Capabilities:
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 02) (prog-if 00 [Normal decode])

CONCLUSION:

Ubuntu can detect the device at the hardware level and the snd_hda-intel kernel driver is installed.

PROBLEM DESCRIPTION:

When I go into sound settings via right-clicking on the speaker, the output section device list is blank.

No audio comes out of the port whether I try Youtube in Chromium or use aplay with a .mp3 file.

Rhythmbox finds the files, and when I click play it turns into a pause symbol. Yet no audio comes out.

Question: How can I use the integrated Intel ALC268 audio device? Or what is the best work-around?