Your attached AlsaInfo.txt seems to have the answer:

Pulseaudio:
      Installed - Yes (/usr/bin/pulseaudio)
      Running - No

So PulseAudio is not running.

This may be due to your edits:

  modified.conffile..etc.pulse.default.pa: [modified]

or it may be due to a crash.

Please follow these instructions to check for a crash of pulseaudio:

https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment

If you can't find any evidence of a crash then please try editing
/etc/pulse/daemon.conf and add a line:

  realtime-scheduling = no

Then reboot and tell us if the problem persists.


** Summary changed:

- ubuntu audio
+ No sound. PulseAudio daemon is not running.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1831592

Title:
  No sound. PulseAudio daemon is not running.

Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  After installing cuda 10.1 updated in my ubuntu 18.04 version. I
  couldn't hear any sound.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: pulseaudio 1:11.1-1ubuntu7.2
  ProcVersionSignature: Ubuntu 4.18.0-20.21~18.04.1-generic 4.18.20
  Uname: Linux 4.18.0-20-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D9p', 
'/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jun  4 16:27:09 2019
  InstallationDate: Installed on 2019-06-04 (0 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 
(20190210)
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  SourcePackage: pulseaudio
  Symptom: audio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/06/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3305
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z10PA-U8 Series
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3305:bd10/06/2016:svnASUSTeKCOMPUTERINC.:pnZ10PA-U8Series:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ10PA-U8Series:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct17:cvrToBeFilledByO.E.M.:
  dmi.product.family: ASUS MB
  dmi.product.name: Z10PA-U8 Series
  dmi.product.sku: All
  dmi.product.version: System Version
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  modified.conffile..etc.pulse.default.pa: [modified]
  mtime.conffile..etc.pulse.default.pa: 2019-06-04T16:13:12.811810

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