tuxguitar doesn't play any sound

Follow these steps:

1. Install the TiMidity++ midi sequencer (apt://timidity-interfaces-extra).
2. Make sure you have tuxguitar-alsa (apt://tuxguitar-alsa), tuxguitar-oss (apt://tuxguitar-oss), and tuxguitar-jsa (apt://tuxguitar-jsa) installed.
3. Launch TuxGuitar, open Tools/Settings/Sound, and under Midi Port choose Gervill or TiMidity Port [x] (128:[x]) (where x is a number in the range of the available midi ports - usually 0..3).

You're good to go!

You will need something to actualy make sound of the midifile that tuxguitar really is. So a midi player (i.e. a softsynth). There are complicated ones like fluidsymth. But the easiest is to use the plugin that goes with tuxguitar. It is a plugin so it might not be installed automatically.

Go to tuxguitar in the Ubuntu Software center and look if you have the java plugin plugin for playback installed. If you havn't, do so. After that you are going to have to enable it in TuxGuitar. Go to the tuxguitar menu to:

Tools --> Settings --> Sound

Under midiport select Gervill

and you have sound.

Let us know if that worked