I tried to setup Openvpn to the Ubuntu 25.10 using https://openvpn.net/cloud-docs/tutorials/configuration-tutorials/connectors/operating-systems/linux/tutorial--learn-to-install-and-control-the-openvpn-3-client.html but unfortunately apt update fails due to the following error:
Hit:1 http://security.ubuntu.com/ubuntu questing-security InRelease
Ign:2 https://packages.openvpn.net/openvpn3/debian questing InRelease
Hit:3 http://archive.ubuntu.com/ubuntu questing InRelease
Hit:4 http://archive.ubuntu.com/ubuntu questing-updates InRelease
Err:5 https://packages.openvpn.net/openvpn3/debian questing Release
404 Not Found
Error: The repository 'https://packages.openvpn.net/openvpn3/debian questing Release' does not have a Release file.
Notice: Updating from such a repository can't be done securely, and is therefore disabled by default.
Notice: See apt-secure(8) manpage for repository creation and user configuration details.
I found https://community.openvpn.net/Pages/OpenVPN3Linux#pre-built-packages and this page says that the pre-built package for the Ubuntu 25.10 exists only in openSUSE Build Service. I tried https://community.openvpn.net/Pages/OpenVPN3Linux#developmentbeta-repository-debian-ubuntu and the installation is successful.
Could you please update your installation instructions
