no sound

[Hoffmann]

cat /proc/asound/cards

cat /proc/asound/cards
 0 [HDMI ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xffb64000 irq 43
 1 [Generic ]: HDA-Intel - HD-Audio Generic
                      HD-Audio Generic at 0xffb60000 irq 16

aplay /usr/share/sounds/alsa/Front_Center.wav

ALSA lib pcm_dmix.c:1052:(snd_pcm_dmix_open) unable to open slave
aplay: main:788: Fehler beim Öffnen des Gerätes: Datei oder Verzeichnis nicht gefunden

lsb_release -rd

Description: Ubuntu 18.04.4 LTS
Release: 18.04

apt-cache policy pkgname

N: Paket pkgname kann nicht gefunden werden.

http://alsa-project.org/db/?f=faeda5de343b2d29e504e3ba0e8fdc20818d5f02

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-91.92-generic 4.15.18
Uname: Linux 4.15.0-91-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.12
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: klaus 14375 F.... alsamixer
CurrentDesktop: GNOME-Flashback:GNOME
Date: Tue Mar 31 18:41:50 2020
InstallationDate: Installed on 2018-07-05 (635 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
PackageArchitecture: all
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
SourcePackage: alsa-driver
Symptom: audio
UpgradeStatus: Upgraded to bionic on 2018-09-01 (577 days ago)
dmi.bios.date: 10/27/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.00
dmi.board.name: QC5000-ITX/PH
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.00:bd10/27/2014:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnQC5000-ITX/PH:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.