I think I have a similar issue, but I couldn't solve it.
In my case I  upgraded pulseaudio manually from 4.0 to 7.0, since yesterday 
everytime I plug in some headphones (bluetooth ones or not) the sound goes 
weird like scratchy..
So, please help me!
Here's my output when I type:
$pulseaudio -v
pulseaudio: relocation error: pulseaudio: symbol pa_sample_rate_valid, version 
PULSE_0 not defined in file libpulse.so.0 with link time reference
$which pulseaudio
/usr/bin/pulseaudio
$ldd `which pulseaudio`
        linux-vdso.so.1 =>  (0x00007ffe99a82000)
        libpulsecore-7.0.so => /usr/lib/libpulsecore-7.0.so (0x00007f031de2e000)
        libpulse.so.0 => /usr/lib/x86_64-linux-gnu/libpulse.so.0 
(0x00007f031dbe5000)
        libpulsecommon-7.0.so => /usr/lib/pulseaudio/libpulsecommon-7.0.so 
(0x00007f031d976000)
        libltdl.so.7 => /usr/lib/x86_64-linux-gnu/libltdl.so.7 
(0x00007f031d76c000)
        libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x00007f031d567000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 
(0x00007f031d348000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f031d144000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f031cd7f000)
        libsndfile.so.1 => /usr/lib/x86_64-linux-gnu/libsndfile.so.1 
(0x00007f031cb16000)
        libspeexdsp.so.1 => /usr/lib/x86_64-linux-gnu/libspeexdsp.so.1 
(0x00007f031c903000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f031c5fd000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f031e0e0000)
        libjson-c.so.2 => /lib/x86_64-linux-gnu/libjson-c.so.2 
(0x00007f031c3f1000)
        libpulsecommon-4.0.so => 
/usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-4.0.so (0x00007f031c18a000)
        libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 
(0x00007f031bf45000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f031bd3c000)
        libFLAC.so.8 => /usr/lib/x86_64-linux-gnu/libFLAC.so.8 
(0x00007f031bb0b000)
        libvorbisenc.so.2 => /usr/lib/x86_64-linux-gnu/libvorbisenc.so.2 
(0x00007f031b63b000)
        libvorbis.so.0 => /usr/lib/x86_64-linux-gnu/libvorbis.so.0 
(0x00007f031b40e000)
        libogg.so.0 => /usr/lib/x86_64-linux-gnu/libogg.so.0 
(0x00007f031b205000)
        libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 
(0x00007f031afe5000)
        libwrap.so.0 => /lib/x86_64-linux-gnu/libwrap.so.0 (0x00007f031addb000)
        libasyncns.so.0 => /usr/lib/x86_64-linux-gnu/libasyncns.so.0 
(0x00007f031abd5000)
        libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 
(0x00007f031a9d0000)
        libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 
(0x00007f031a7ca000)
        libnsl.so.1 => /lib/x86_64-linux-gnu/libnsl.so.1 (0x00007f031a5af000)
        libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 
(0x00007f031a394000)

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https://bugs.launchpad.net/bugs/474714

Title:
  pulseaudio not working

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