OpenVPN command "source vars" not found

[Gert Kruger]

When I tried to run: $ source vars or $ sudo source vars I get an error: source: command not found

I have Ubuntu 18.10 desktop installed installed? Perhaps I need to install server packages?

[Gert Kruger (hgkrug1)]

OK I found the solution at https://unix.stackexchange.com/questions/202332/sudo-source-command-not-found/202334 but it gave another problem:

$ sudo -s source vars
You appear to be sourcing an Easy-RSA 'vars' file.
This is no longer necessary and is disallowed. See the section called
'How to use this file' near the top comments for more details.

[KWhat (alex.barker)]

The easy rsa documentation in this guide is outdated and should be updated. Many of the commands after source vars are not available and should be converted to ./easyrsa commands. Even the configuration data in /etc/openvpn/easy-rsa/vars is incorrect / outdated. In its current state, the Ubuntu guide will not work with 18.04. I have been working off 3rd party guides like: https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-18-04