title: Mercurial unbundle error: abort: ... unknown bundle version 20
body: <p>I'm on linux ubuntu 14.04 lts and I use Mercurial Distributed SCM (version 3.3.2). I try to unbundle a mercurial hg bundle made on Mac osx with command line: </p>
  
  <hr>
  
  <p><em>hg unbundle  XXX.hg</em></p>
  
  <p><em>abort: XXX.hg: unknown bundle version 20</em></p>
  
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  <p>Does anyone have a clue what is going on? Google research has not been providing much informations about that.</p>