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Though I have gone through quite a few threads on AskUbuntu (1, 2, 3), and elsewhere, I'm little confuse on how to proceed.

I'd like to completely remove ufw, delete all iptables chains and rules, for a fresh start with nftables firewall in Ubuntu MATE 19.04

If I understand correctly (from the threads I have linked), I need to run the following:

sudo systemctl reset ufw

sudo systemctl disable ufw

sudo apt purge ufw gufw

sudo iptables -F

sudo iptables -Z

Then ?

for i in `iptables -L INPUT --line-numbers |grep '[0-9].*ufw' | cut -f 1 -d ' ' | sort -r `; do iptables -D INPUT $i ; done
for i in `iptables -L FORWARD --line-numbers |grep '[0-9].*ufw' | cut -f 1 -d ' ' | sort -r `; do iptables -D FORWARD $i ; done
for i in `iptables -L OUTPUT --line-numbers |grep '[0-9].*ufw' | cut -f 1 -d ' ' | sort -r `; do iptables -D OUTPUT $i ; done
for i in `iptables -L | grep 'Chain .*ufw' | cut -d ' ' -f 2`; do iptables -X $i ; done

The questions I have are:

(1) How do I "disable or deactivate" iptables so it doesn't interfere with Nftables firewall later on.

(2) In addition to removing ufw, should I remove iptables too:

sudo apt remove --auto-remove iptables

(3) Then proceed with installing and configuring nftables, is this the correct order?

Jags
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1 Answers1

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How To Uninstall ufw On Ubuntu 16.04 LTS

(Work in Debian 11 with just apt intead of apt-get for me)

To uninstall ufw just follow these instructions.

×Are you having problems? You can always add ufwagain by following the instructions at this link.

Uninstall just ufw

sudo apt-get remove ufw

This will remove just the ufw package itself.

Uninstall ufw and its dependencies

sudo apt-get remove --auto-remove ufw

This will remove the ufw package and any other dependant packages which are no longer needed.

Purging your config/data too If you also want to delete your local/config files for ufw then this will work.

Caution! Purged config/data can not be restored by reinstalling the package.

sudo apt-get purge ufw

Or similarly, like this ufw

sudo apt-get purge --auto-remove ufw

Taking from https://installlion.com/ubuntu/xenial/main/u/ufw/install/index.html

Need to Unintall iptable too? https://installlion.com/ubuntu/vivid/main/i/iptables/uninstall/index.html

HillSonMX
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