Download the Nekoray app from Github. Select the latest version and click Assets. Download the deb file, for example, nekoray-3.26-2023-12-09-debian-x64.deb
Right click on the DEB file and select Open with other application.
Select Software Install.
Install Nekoray and confirm permission to launch.
Launch the Nekoray application.
Add xVPN subscription.
Enter any name, select Subscriptions type. In the URL field, copy the link to xVPN subscription from the section Subscriptions.
If necessary, you can update the list of connections.
Mark checkboxes System proxy and Tun mode.
Connect to xVPN. Right click on the connection and select Start.
Confirm Nekoray core launch.
Similarly, you can disconnect from xVPN connection.