pulseaudio crashed with SIGABRT in pa_startswith() from pa_alsa_mapping_get() from mapping_parse_channel_map() from normal_assignment() from parse_line()

Xenial 16.04 gnome beta using compiz

Well-behaved except sound remains @ analog two channel no matter what changes. Dual-boot system to Windows 10 Pro N plays five-dot-one normally. System is new Lenovo h50-55.

Attempts over the past 30 days that the system has been up yield no positive result.

2Gig HD was reformated to remove vendor bloat and new installs of Windows 10 & Xenial Xerus 16.04. Updates installed daily.

H50-55 is a system drop-in replacement for 2006 HP Pavilion m7570n & Ubuntu 14.04, flawless sound in 5.1.

Realizing that 21 April is release date for Xenial 16.04.
denny@Wildlife:~$ apt-cache policy pulseaudio
pulseaudio:
  Installed: 1:8.0-0ubuntu2
  Candidate: 1:8.0-0ubuntu2
  Version table:
 *** 1:8.0-0ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status
denny@Wildlife:~$

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: pulseaudio 1:8.0-0ubuntu2 [modified: usr/share/pulseaudio/alsa-mixer/profile-sets/default.conf]
ProcVersionSignature: Ubuntu 4.4.0-14.30-generic 4.4.5
Uname: Linux 4.4.0-14-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D2c', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/controlC1', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Sat Mar 19 08:26:30 2016
ExecutablePath: /usr/bin/pulseaudio
InstallationDate: Installed on 2016-03-08 (11 days ago)
InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160304)
ProcCmdline: /usr/bin/pulseaudio --start --log-target=syslog
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/false
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
Signal: 6
SourcePackage: pulseaudio
StacktraceTop:
 pa_startswith () from /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-8.0.so
 pa_alsa_mapping_get () from /usr/lib/pulse-8.0/modules/libalsa-util.so
 ?? () from /usr/lib/pulse-8.0/modules/libalsa-util.so
 pa_config_parse () from /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-8.0.so
 pa_alsa_profile_set_new () from /usr/lib/pulse-8.0/modules/libalsa-util.so
Title: pulseaudio crashed with SIGABRT in pa_startswith()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 08/20/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: IRKT54AUS
dmi.board.name: Bantry CRB
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnLENOVO:bvrIRKT54AUS:bd08/20/2015:svnLENOVO:pn90BG003JUS:pvrLenovoH50-55:rvnLENOVO:rnBantryCRB:rvrSDK0J40709WIN:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: 90BG003JUS
dmi.product.version: Lenovo H50-55
dmi.sys.vendor: LENOVO
modified.conffile..etc.pulse.daemon.conf: [modified]
modified.conffile..etc.pulse.default.pa: [modified]
mtime.conffile..etc.pulse.daemon.conf: 2016-03-19T08:08:17.500548
mtime.conffile..etc.pulse.default.pa: 2016-03-19T08:12:41.670208