[Mashiro]

Why not simply use the already available iptables? Anyway...

Can you run the command below and post the output:

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/usr/share/ufw/check-requirements

Also please post the output of the rules that are being loaded by ufw? So we can see what "line 2" is.

Also the error message you posted... was that it? Nothing more?

Can you run the enable command again and after that post the output of:

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journalctl -xe