ffmpeg -i video.mp4 -f mp3 -ab 192000 -vn music.mp3But there's a catch: You have to have ffmpeg and the libavcode-unstripped-52 packages installed on your computer. The problem is that second package is available in the multiverse respository only. To enable the multiverse repository, select Administration from the System menu, then Software Sources.
Mark Logic server is, unbelievably, not supported on Ubuntu 8.10. However, the server runs just fine on that distribution. The following installation instructions might save you some time.
sudo apt-get install rpm
sudo apt-get install alien