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A few days ago I was telling you about increasing the soft volume in MPlayer to 300%. I know a lot of people are experiencing a very low sound level in Ubuntu, so here is another trick to increase the sound (soft volume) in Ubuntu Linux, this time system-wide.

1. Edit your /etc/asound.conf file.

Press ALT + F2 on your keyboard and type:
gksu gedit /etc/asound.conf

2. Paste the following into the asound.conf file:

pcm.!default {
type plug
slave.pcm "softvol"

pcm.softvol {
type softvol
slave {
pcm "dmix"
control {
name "Pre-Amp"
card 0
min_dB -5.0
max_dB 20.0
resolution 6

3. Restart PulseAudio:
pulseaudio -k >/dev/null 2>&1

To make sure pulseaudio is stopped:
killall pulseaudio

And then:
pulseaudio -D
pulseaudio ;

If that doesn't work, restart your system.

More info on soft volume.