This is for the situation that you're doing other things that may conflict or have your own custom rules and ufw keeps overriding iptables.

A lot of guides don't work, and even ufw reset does not work, because it still leaves the old ufw chains.

Here is what works to disable ufw completely

systemctl stop ufw


systemctl disable ufw

ufw disable


rm -f /etc/ufw/*


iptables -F

Now run this script to finish the job

This script will delete all of the old ufw chains.

for chain in `iptables -L|grep ufw|awk '{print $2}'`; do
iptables -X $chain
done

Do this in case:

Sometimes the default iptables policy for FORWARD, OUTPUT, INPUT will be drop

iptables --policy FORWARD ACCEPT

iptables --policy INPUT ACCEPT

iptables --policy OUTPUT ACCEPT

We can see all the old chains below before running the script and then after the script they are all deleted.

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