Comment 9 for bug 274124

I'm having the same problem. When I ran the command pulseaudio in terminal, I got
ginny@ginny-desktop:~$ pulseaudio
W: ltdl-bind-now.c: Failed to find original dlopen loader.
E: pid.c: Daemon already running.
W: main.c: setrlimit(RLIMIT_NICE, (31, 31)) failed: Operation not permitted
W: main.c: setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Operation not permitted
ALSA lib control.c:909:(snd_ctl_open_noupdate) Invalid CTL front:0
ALSA lib control.c:909:(snd_ctl_open_noupdate) Invalid CTL front:0
E: socket-server.c: bind(): Address already in use
E: module.c: Failed to load module "module-esound-protocol-unix" (argument: ""): initialization failed.
E: main.c: Module load failed.
E: main.c: Failed to initialize daemon.
E: pid.c: PID file '/tmp/pulse-ginny/pid' not mine!

I'm using an Intel onboard sound card, 82081G(ICH7 Family)