You need to install xl2tpd package. Here are the commands I use on Elementary OS Hera:
sudo apt-add-repository ppa:nm-l2tp/network-manager-l2tp
sudo apt update
sudo apt install xl2tpd network-manager-l2tp network-manager-l2tp-gnome
After that you can add new VPN from Network settings. And now you can see new L2TP on dropdown menu.
Based on your lspci output, I can see that it looks like you have an Intel AX200 WiFi card. Hopefully this will help as an extra search term in your own research. elementary OS 6.0 Juno/Hera is based on Ubuntu 18.04, so search terms like "Ubuntu 18.04 Intel AX200" are likely to turn up relevant results.
bcmwl-kernel-source is a driver for Broadcom ...
I have noticed that the problem is due to the installation of the latest updates, if I boot with a previous version of elementary (second choice at startup) the printer works perfectly, with the latest version it stops working.
I just wanted to let you know, not that it will yield anything because when one sees the questions circulating and the solutions ...
Also encountered this quirk in elementary OS 5.1.7 Hera. There is no Forget this network style option for quick removal. It has to be removed manually.
The terminal-based method, as per the follow-up comment by rdanter and the manual removal procedure in Debian is:
sudo rm WIFINEWTORK
This solves the issue in my ...