$ pulseaudio --verbose
main.c: WARNING: called SUID root, but not in group 'realtime'.
socket-server.c: socket(PF_INET6): Address family not supported by protocol
protocol-native.c: loading cookie from disk.
module.c: Loaded "module-native-protocol-tcp" (index: #0; argument: "auth-anonymous=1").
module-volume-restore.c: starting with empty ruleset.
module.c: Loaded "module-volume-restore" (index: #1; argument: "").
ALSA lib pcm_dmix.c:864:(snd_pcm_dmix_open) unable to open slave
module-alsa-sink.c: Error opening PCM device default: Device or resource busy
module.c: Failed to load  module "module-alsa-sink" (argument: "sink_name=output"): initialization failed.
main.c: daemon/main.c : Fatal error. Default sink name (output) does not exist in name register.
module.c: Unloading "module-native-protocol-tcp" (index: #0).
module.c: Unloaded "module-native-protocol-tcp" (index: #0).
module.c: Unloading "module-volume-restore" (index: #1).
module.c: Unloaded "module-volume-restore" (index: #1).