Choosing a sound device

How exactly do it with linux lubuntu 15.10?

Does lubuntu use pulseaudio ?

what’s the output from:

dpkg -l | grep pulseaudio

And just as a matter of interest, can I ask why you chose Lubuntu over Peppermint ?

Becausemy computer is very weak
& I do not know how to use it.& how to install it.

Peppermint (not Mint) is based on Lubuntu, but comes with things like pulseaudio out of the box … so is generally easier to configure

Anyway, how about the output I asked for ?

rami@rami-System-Product-Name:~$ dpkg -l | grep pulseaudio
rami@rami-System-Product-Name:~$
so what to do?

Your options are to configure your sound device(s) via:

alsamixer

or to install pulseaudio:

sudo apt-get install pulseaudio pulseaudio-utils pavucontrol

then configure it via:-

menu > Sound & Video > PulseAudio Volume Control