Network Manager on Linux has a command line interface which can do everything and more than the gui version. Here is how to import an openvpn config from the command line!
In this example, the openvpn config is a single file from pfSense (Inline Configurations > Other, in pfSense speak) which works well for Linux users.
Import as follows, where the filename in this example is is: bach-udp-1194-khmiller-config.ovpn
$ sudo nmcli connection import type openvpn file bach-udp-1194-khmiller-config.ovpn Connection 'bach-udp-1194-khmiller-config' (5b04c610-ca37-4f76-bb61-07e9acdc603a) successfully added.
nmcli does have tab completion, so when in doubt hit tab as options are typed to see what is possible.
$ sudo nmcli [TAB] agent connection device general help monitor networking radio $ sudo nmcli connection [TAB] add clone delete down edit export help import load modify monitor reload show up $ sudo nmcli connection edit [TAB]