Sound is not working in ubuntu 14.04

Do you get sound in headphones?

No. But when I run Android simulator, I am getting proper sound. That is the only time I got sound from this machine after I got the issue for the first time...

If you run:

alsamixer

Are all levels maxed and unmuted. Use ESC to exit and cursor keys as you expect. Use M to un/mute and F6 to change the device manipulated.

Then run the sound application from the Dash and repeat.

Your Terminal output shows the following sound card:

!!PCI Soundcards installed in the system
!!--------------------------------------
00:1f.3 Audio device: Intel Corporation Device 9d70 (rev 21)

!!Advanced information - PCI Vendor/Device/Subsystem ID's
!!-------------------------------------------------------
00:1f.3 0403: 8086:9d70 (rev 21)

If you search for "8086 9d70 LKDDB" via Google, you will find this:

https://cateee.net/lkddb/web-lkddb/SND_HDA_INTEL.html

That LKDBB website shows this:

lkddb pci 8086 9d70 .... .... ...... : CONFIG_SND CONFIG_SND_HDA_INTEL : sound/pci/hda/hda_intel.c # in 3.18–3.19, 4.0–4.11, 4.12-rc+HEAD

This means that your PC should at LEAST be running Linux kernel 3.18 or higher.

Problem is that your PC is currently running 3.13.0-119-generic which is LOWER than the minimum kernel version supporting your sound card.

The best solution is to perform a backup of all your data and performing a clean install of Ubuntu 16.04.2.

The search procedure above is fully explained in the following sound troubleshooting procedure:

https://help.ubuntu.com/community/SoundTroubleshootingProcedure

http://ubuntuhandbook.org/index.php/2017/02/install-kernel-4-10-ubuntu-linux-mint/

I suspect that your audio chipset is experiencing the following bug, which is not solved yet:

https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1652611