I had this message in Ubuntu 8.04 when I tried to launch Applications > Sound & Video > Sound Recorder.
I went to System > Preferences > Sounds and in 'Audio Conferencing' I changed the option 'ALSA - Advanced Linux Sound Architecture' to 'PulseAudio Sound Server'.
Anyway, most end users (including me) do not have an idea of what is all about and documentation is not very clear.
I had this message in Ubuntu 8.04 when I tried to launch Applications > Sound & Video > Sound Recorder.
I went to System > Preferences > Sounds and in 'Audio Conferencing' I changed the option 'ALSA - Advanced Linux Sound Architecture' to 'PulseAudio Sound Server'.
Anyway, most end users (including me) do not have an idea of what is all about and documentation is not very clear.