Dell XPS 13 Ubuntu 16.04.02 no sound

I feel like I've tried all the answers but no luck in solving the problem. I fresh installed Ubuntu 16.04.02 LTS from Windows 8 initially. Everything was working fine except sound, which does't work at all. This is the output of aplay -l

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Only HDA Intel HDMI is detected, and I've no idea why. Any help is appreciated!