UFW & Iptables not working in Debian 10

By @AnthonySmith

If you are getting an iptables related issue generally or when trying to use an OpenVPN installer script or general VPN setup and the error is similar to:

iptables-restore v1.8.4 (legacy): couldn't load match `limit':no such file or directory

or

iptables v1.8.2 (nf_tables): unknown option "--dport"

or

iptables v1.8.4 (nf_tables): unknown option "--dport"

or

error: couldn't determine iptables version

The...

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