Traceback (most recent call last):
  File "/usr/bin/apt-clone", line 113, in <module>
    args.source, args.destination, args.new_distro_codename, protect_installed)
  File "/usr/lib/python2.7/dist-packages/apt_clone.py", line 285, in restore_state
    self._restore_package_selection(statefile, targetdir, protect_installed)
  File "/usr/lib/python2.7/dist-packages/apt_clone.py", line 403, in _restore_package_selection
    self._restore_package_selection_in_cache(statefile, cache, protect_installed)
  File "/usr/lib/python2.7/dist-packages/apt_clone.py", line 383, in _restore_package_selection_in_cache
    resolver.resolve()
SystemError: E:Unable to correct problems, you have held broken packages.