Try copying the file to /etc/wireguard and doing sudo systemctl start wg-quick@wg . This should bypass freedesktop and enable you to raise the interface. You can replace "wg" in systemctl start wg-quick@wg with whatever name your config file is. I use wg because your file is named wg.conf, but I do recommend renaming it after the airvpn server you are using, or some other nickname you have for it, like america. So, try copying it as america.conf into /etc/wireguard, then doing systemctl start wg-quick@america. If it fails, do systemctl status wg-quick@america and show the logs here