Ubuntu Headless 11.04 and Audio

[augustiner_moench]

I want to run sounds over my pandaboard

if i'm trying to play some audiofiles, i get an error:

taotao@pandaboard:~$ mplayer -vo fbdev /home/taotao/media/mp3/03.mp3
MPlayer 1.0rc4-4.5.2 (C) 2000-2010 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote
control.

Playing /home/taotao/media/mp3/03.mp3.
Audio only file format detected.
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
AO: [pulse] Init failed: Connection refused
Failed to initialize audio driver 'pulse'
[AO_ALSA] alsa-lib: confmisc.c:768:(parse_card) cannot find card '0'
[AO_ALSA] alsa-lib: conf.c:4184:(_snd_config_evaluate) function
snd_func_card_driver returned error: No such file or directory
[AO_ALSA] alsa-lib: confmisc.c:392:(snd_func_concat) error evaluating
strings
[AO_ALSA] alsa-lib: conf.c:4184:(_snd_config_evaluate) function
snd_func_concat returned error: No such file or directory
[AO_ALSA] alsa-lib: confmisc.c:1251:(snd_func_refer) error evaluating
name
[AO_ALSA] alsa-lib: conf.c:4184:(_snd_config_evaluate) function
snd_func_refer returned error: No such file or directory
[AO_ALSA] alsa-lib: conf.c:4663:(snd_config_expand) Evaluate error: No
such file or directory
[AO_ALSA] alsa-lib: pcm.c:2212:(snd_pcm_open_noupdate) Unknown PCM
default
[AO_ALSA] Playback open error: No such file or directory
Failed to initialize audio driver 'alsa'
[AO SDL] Samplerate: 44100Hz Channels: Stereo Format s16le
[AO SDL] using aalib audio driver.
[AO SDL] Unable to open audio: No available audio device
Failed to initialize audio driver 'sdl:aalib'
Could not open/initialize audio device -> no sound.
Audio: no sound
Video: no video


Exiting... (End of file)
taotao@pandaboard:~$


anyone know how to enable audio?