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 so
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.
