Nowadays Ubuntu uses PulseAudio, so to setup recording froman application you need PulseAudio Volume Control> sudo apt-get install pavucontrol 1. Start PulseAudio Volume Control (Applications > Sound & Video) 2. Start the application plaing the sound (vlc, browser, or whatever) 3. PulseAudio Volume Control > Playback Tab Make sure the application is listed there and that the level indicator registers the audio 4. Start the capture, use Sound Recorder or Audacity 5. PulseAudio Volume Control > Recording Tab Change Record stream from: "Internal Audio Analog Stero" to "Monitor of Internal Audio Analog Stereo"