Whoever is able to reproduce this,  to figure out what is keeping the device 
pinned, could you replace the
    run_cmd('sleep', '10');
above with
   run_cmd('ps', '-ef');
   run_cmd('lsof', '%s/dev')
   run_cmd('mount')

and post the results here?

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https://bugs.launchpad.net/bugs/879710

Title:
  ubuntu-vm-builder crashes when trying to umount tmp directory.

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