gufw issues after upgrading to python3.5 - ubuntu 16

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Traceback (most recent call last):  File "/usr/share/gufw/gufw/gufw.py", line 19, in <module>    from controller import Controller   File "/usr/share/gufw/gufw/controller.py", line 18, in <module>    from model.frontend import Frontend  File "/usr/share/gufw/gufw/model/frontend.py", line 18, in <module>    from firewall import FirewallImportError: No module named 'firewall'