App security on the Librem 5

Currently iptables does not work out of the box on Librem5 chestnut phone with PureOS.

root@pietro:~# uname -r
5.3.0-librem5-h1
root@pietro:~# iptables -L -n -v
iptables: Operation not supported.

I had to modprobe iptable_filter then iptable said that I have to use iptables_legacy

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