PCI/internal sound card not detected

[Paun Remus]

Installed Ubuntu 14.04 LTS. At first sound worked. Now it does not work any more. Could not find driver or specifications on how to reinstall the driver on the internet. Laptop is Dell Inspiron 5000 Series.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-35.40~14.04.1-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: Unity
Date: Thu Apr 21 20:44:42 2016
InstallationDate: Installed on 2016-04-13 (7 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_AU:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/21/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.1.5
dmi.board.name: 04D1V1
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.1.5:bd12/21/2015:svnDellInc.:pnInspiron5559:pvr:rvnDellInc.:rn04D1V1:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Inspiron 5559
dmi.sys.vendor: Dell Inc.