I was having problems with sound (mono only output), so following advice from another askubuntu question I made some edits in /etc/pulse/default.pa

After rebooting I had no sound at all. So I deleted /etc/pulse/default.pa entirely and tried another reboot. I did not backup the file (stupid, I know).

How to come back to working config?

edit:

I tried:

sudo apt-get remove pulseaudio
(reboot)
sudo apt-get install pulseaudio
(reboot)

It's still not working. The file /etc/pulse/default.pa is missing.

Here's what pulseaudio and pacmd commands show:

$ pulseaudio 
E: [pulseaudio] main.c: Daemon startup without any loaded modules, refusing to work.
$ pacmd
No PulseAudio daemon running, or not running as session daemon.