Set Ubuntu volumn

alsamixer (1)        - soundcard mixer for ALSA soundcard driver, with ncurses interface
amixer (1)           - command-line mixer for ALSA soundcard driver
gnome-alsamixer (1)  - ALSA sound mixer for GNOME

Here is an example by using amixer to set the volumn to 60%:

/usr/bin/amixer -c 0 sset Master,0 80% > /dev/null 

You might want to try adding that line to to /etc/rc.local