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python-six package from Ubuntu 12.04 LTS remains version 1.1.0, which prevents ryu-manager from being started and raises exception "AttributeError: 'module' object has no attribute 'add_metaclass'". Signed-off-by: Wei-Li Tang <alextwl@xinguard.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>