Mixxx doesn't produce any sounds

what sound device did you set in the preferences? It might be that mixxx
picked a sound device where you don't have any speakers connected. I'm
not sure if ubuntu also uses pulse-audio these days but I assume it
does. Then you can check with pavu-control if pulse notices that mixxx
wants to play some sounds

On Mon, 2014-04-14 at 07:34 +0000, Linux Lover wrote:
> Public bug reported:
>
> Mixxx doesn't produce any sounds when playing music.
>
> Step to reproduce:
>
> 1) Install Mixxx
> 2) Scan music directory
> 3) Play a song
> 4) No sound output
>
> ProblemType: Bug
> DistroRelease: Ubuntu 14.04
> Package: mixxx 1.10.1~dfsg0-1
> ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
> Uname: Linux 3.13.0-24-generic x86_64
> ApportVersion: 2.14.1-0ubuntu2
> Architecture: amd64
> CurrentDesktop: GNOME
> Date: Mon Apr 14 00:26:33 2014
> EcryptfsInUse: Yes
> InstallationDate: Installed on 2014-04-03 (11 days ago)
> InstallationMedia: It
> ProcEnviron:
> PATH=(custom, no user)
> XDG_RUNTIME_DIR=<set>
> LANG=en_US.UTF-8
> SHELL=/bin/bash
> SourcePackage: mixxx
> UpgradeStatus: No upgrade log present (probably fresh install)
>
> ** Affects: mixxx (Ubuntu)
> Importance: Undecided
> Status: New
>
>
> ** Tags: amd64 apport-bug trusty
>

I have tested every singe device listed in preferences but it still does not reproduce any sounds.
And yes, Ubuntu does use PulseAudio. :)

Status changed to 'Confirmed' because the bug affects multiple users.