install and usage of the uncomplicated firewall ufw / gufw [debian 64bit]

based on:
https://help.ubuntu.com/community/UFW
https://www.linode.com/docs/security/firewalls/configure-firewall-with-ufw

install:
sudo apt-get install ufw gufw

fix gufw starter (put a # infront of the line #OnlyShowIn=Unity;):
sudo nano /usr/share/applications/gufw.desktop

check status:
sudo ufw status

enable it:
sudo ufw enable

disable it:
sudo ufw disable

start the gui to add rules:
sudo gufw

show added rules:
sudo ufw show added

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