Ubuntu 19.10：“添加”OpenVPN 连接呈灰色

Question

我尝试在完全更新的 Ubuntu 19.10 PC 上添加新的 OpenVPN 连接，但Add顶部按钮呈灰色：

我已经尝试过：

zane@zane-pc:~$ sudo apt-get install network-manager-openvpn network-manager-openvpn-gnome
Reading package lists... Done
Building dependency tree       
Reading state information... Done
network-manager-openvpn is already the newest version (1.8.10-1).
network-manager-openvpn-gnome is already the newest version (1.8.10-1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
zane@zane-pc:~$ sudo systemctl restart network-manager
zane@zane-pc:~$ sudo service openvpn restart

还有什么？