Install OpenVPN Access Server on Debian 13 or Ubuntu 26

 Install Debian or Ubuntu on a box.  This example has it being installed on ProxMox

Tested on a standard server installation of Debian 13.2.0 or Ubuntu Server 26.04 LTS

The only 'additional' option I added at time of install was the SSH server.

Once installed the box was patched

sudo apt update && sudo apt upgrade -y

My installation didn't come with CURL so it errored, you can install CURL this way

sudo apt install curl

Then the following command was run (from the access server install on the openVPN site).  And it did the whole thing for this installation.  For Ubuntu, you will need to run as root, so "Sudo su" first.

bash <(curl -fsS https://packages.openvpn.net/as/install.sh) --yes

It will go through a bunch of installation routines.  

You should note that the installation will generate a user/password during install.   It will look something like below.   So its best to do the install in a system where you can easily scroll back the console history, else it will be difficult to logon.

When you get a "Installation successful!" response.  You should be able to HTTPS to the box

https://IPofServer:943/admin

Enter in your credentials

openvpn / XTI5Xj8Fqy2e

You'll get prompted with a License Agreement

You'll be in the GUI now.  Newer version after the intial writing of this page will prompt you to download the client, you can skip those steps with the button in the corner

Change the GUI openvpn admin password

Goto USERS -> OpenVPN -> Reset Password