Answer by Daniele Santi for Large .xsession-errors file, PulseAudio

Looks like your KDE is configured to use Pulse Audio as an engine for Phonon Backend, and for some reason the Pulse Audio daemon itself is not installed/not responding.

I suggest you make sure the phonon-backend-gstreamer is installed:

sudo apt-get install phonon-backend-gstreamer

and then go to KDE audio preferences and check that "Gstreamer" is configured as a backend.

Completely uninstall pulseaudio and make gstreamer use alsa instead:

sudo apt-get purge pulseaudio gstreamer0.10-pulseaudiosudo apt-get autoremovesudo apt-get install alsa-base alsa-tools alsa-tools-gui alsa-utils alsa-oss linux-sound-base alsamixerguisudo apt-get install esound esound-clients esound-common libesd-alsa0 gnome-alsamixer

Then restart your computer.

After that, run

gstreamer-properties

to setup Gstreamer defaults (which now will use alsa).

Then check if the errors related to Pulse Audio go away.