heath@hj-xubuntu:~$ gufw
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 Firewall
  File "/usr/share/gufw/gufw/model/firewall.py", line 19, in <module>
    from netifaces import interfaces, ifaddresses, AF_INET
ImportError: No module named netifaces