L2TP VPN is not working on Ubuntu 20.04. Same credential is working fine with Ubuntu 18.04

The package network-manager-l2tp is required.

You may have to install it:

sudo apt install network-manager-l2tp

I hope it helps


I was facing this myself in Ubuntu 20.04 and 21.04, and a simple one-liner solved all requirements necessary for my L2TP/IPsec setup to work properly:

sudo apt install --install-suggests network-manager-l2tp-gnome

This installs all packages mentioned in the previous answers, too. Endpoint to connect to is a Ubiquiti EdgeRouter ERLite-3.