You definitely should not be running a OpenVPN 2.4.4 at this point. Which version of Ubuntu is that? And which version of OpenSSL? If you update your version of Ubuntu you should also get a newer version of OpenVPN. Even Ubuntu 20.04 which is the oldest supported one has OpenVPN 2.4.7.
If you want the latest version we also offer packages for all supported Ubuntu versions, see
https://community.openvpn.net/openvpn/wiki/OpenvpnSoftwareRepos#DebianUbuntu:UsingOpenVPNaptrepositories