Wireguard not working under debian-12-xfce in Q4.2

[procShield]

We all have to learn nftables if we want VPN in R4.2.

Qubes OS 4.2 nftables / nft firewall guide

They have been using nftables in their Linux application for quite some time, so it works on Qubes 4.2. You need to learn the syntax of nftables and how it works. iptables is considered deprecated and is already replaced by nftables under the hood in some distributions.