no audio

[Josh Taneja]

audio stopped working after update to 16.04

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: Unity
Date: Thu Jun 30 23:16:48 2016
InstallationDate: Installed on 2014-04-17 (806 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140415)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: Upgraded to xenial on 2016-06-04 (26 days ago)
dmi.bios.date: 03/21/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 8GET39WW (1.16 )
dmi.board.name: 786035U
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8GET39WW(1.16):bd03/21/2012:svnLENOVO:pn786035U:pvrThinkPadL520:rvnLENOVO:rn786035U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 786035U
dmi.product.version: ThinkPad L520
dmi.sys.vendor: LENOVO