midi ok in windows but only drums in linux

[vector457]

I have the same script extracted from the manuals which was written and 
working on a windows box.
I got it home and put it on the ubuntu machine and only the drums sound. 
I have lost the "flute" notes? (when played with movie player)
Have I not assigned the midi properly? or is it something weird on this 
ubuntu machine.


\version "2.12.3"
\score {
  \new Staff <<
    \new Voice \relative c''' {
      \set midiInstrument = #"flute"
      \voiceOne
      \key g \major
      \time 2/2
      r2 g-"Flute" ~
      g fis ~
      fis4 g8 fis e2 ~
      e4 d8 cis d2
    }
    \new DrumStaff {
       \drummode{bassdrum4 snare8 bd r bd sn4}
    }
>>
  \layout{}
  \midi{}
  }