thank you for your bug report, the stacktrace indicates that's a
pulseaudio issue
** Changed in: pulseaudio (Ubuntu)
Sourcepackagename: gnome-control-center = pulseaudio
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gnome-sound-properties crashed with SIGSEGV in pthread_join()
https://bugs.launchpad.net/bugs/252706
You received this bug
** Attachment added: CoreDump.gz
http://launchpadlibrarian.net/16368973/CoreDump.gz
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/16368974/Dependencies.txt
** Attachment added: Disassembly.txt
http://launchpadlibrarian.net/16368975/Disassembly.txt
** Attachment
