Sounds like a pain to configure compared to some of the more designated systems. Is the advantage that you use Ubuntu for other things as well, so it's a more multifunctional system?
My current setup runs OPNsense on an x86 machine with 2.5Gbps ports (as an LXC inside proxmox), whereas the one in my post only has 1Gbps ports. But the location of it isn't great for wifi, which is why I want to use this separate machine for wifi only. So there's really no need for me to do firewall etc. on this one, I really just want something that can do VLAN'd wifi networks.
I'd probably have to buy something before it supports WiFi. It's built to run pfsense (has 4 ethernet ports) so I imagine that it would run just fine if I got it a good antenna, but who knows.
I also use opnsense on a mini pc as a firewall, works great :)
Seems that using it for WiFi is a little iffy based on most of these comments though. The guide you linked also didn't cover much info about hardware, and I can't see VLAN-support either, so maybe I should just give in and buy a ubiquity one instead.
I already have opnsense on another one like this, so I don't need a second firewall. Also, for the WiFi one, it doesn't have to be opnsense. Someone mentioned openwrt which I wouldn't mind using.
Doesn't seem to be what I'm after but thanks for sharing