You can disable it permanently under System > Preferences > Session
Pulseaudio is a network sound server. I'm not sure, but i think you don't realy 
use it, may by some applications like Skype. More details here: 
http://www.pulseaudio.org/wiki/AboutPulseAudio

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ALSA lib pcm_bluetooth.c:1619:(bluetooth_init) BT_GETCAPABILITIES failed : 
Input/output error(5)
https://bugs.launchpad.net/bugs/285412
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