Whenever I try to access my VPN, I get the following log in my journal.

nayar-laptop NetworkManager[944]: <info> [1506058591.5368] audit: op="connection-activate" uuid="d084ff89-8560-47fd-85c9-b8704f1d7850" name="New vpn connection" pid=29102 uid=1000 result="fail" reason="The VPN service 'org.freedesktop.NetworkManager.l2tp' was not installed."

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root@nayar-laptop:~# lsb_release -a
No LSB modules are available.
Distributor ID: neon
Description:    KDE neon User Edition 5.10
Release:        16.04
Codename:       xenial


network-manager-l2tp isn't an official package with Ubuntu 16.04 LTS (xenial), but is with Ubuntu 17.10 and later.

So you will need to install it from the PPA repository, i.e :

sudo add-apt-repository ppa:nm-l2tp/network-manager-l2tp
sudo apt-get update
sudo apt-get install network-manager-l2tp


See:
https://launchpad.net/~nm-l2tp/+archive ... nager-l2tp