3168.666583] vboxguest: module verification failed: signature and/or required 
key missing - tainting kernel 
[ 3168.671599] vgdrvHeartbeatInit: Setting up heartbeat to trigger every 2000 
milliseconds 
[ 3168.672097] input: Unspecified device as 
/devices/pci0000:00/0000:00:04.0/input/input7 
[ 3168.673418] vboxguest: misc device minor 56, IRQ 20, I/O port d020, MMIO at 
00000000f0400000 (size 0x400000) 
[ 3168.673419] vboxguest: Successfully loaded version 5.0.10_Ubuntu (interface 
0x00010004)
 [ 3168.689728] [drm] Initialized drm 1.1.0 20060810 
[ 3168.694728] piix4_smbus 0000:00:07.0: SMBus base address uninitialized - 
upgrade BIOS or use force_addr=0xaddr 
[ 3168.846991] [drm] Initialized vboxvideo 1.0.0 20090303 for 0000:00:02.0 on 
minor 0 
[ 3168.903905] AVX version of gcm_enc/dec engaged. 
[ 3168.903907] AES CTR mode by8 optimization enabled 
[ 3169.198110] intel_rapl: no valid rapl domains found in package 0 
[ 3169.332374] snd_intel8x0 0000:00:05.0: disable (unknown or VT-d) VM 
optimization 
[ 3169.556116] Adding 975868k swap on /dev/sda1. Priority:-1 extents:1 
across:975868k FS 
[ 3169.621817] snd_intel8x0 0000:00:05.0: white list rate for 1028:0177 is 48000

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https://bugs.launchpad.net/bugs/1520564

Title:
  Xubuntu 15.10 low and poor sound on USB headset

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