Comment 6 for bug 1968588

I can confirm the bug running a brand new Lubuntu 22.04, with package network-manager-vpnc-gnome version 1.2.8-2.

Running nm-connection-manager on a terminal, trying to add a new connection, Cisco Compatible VPN (vpnc), we can see the following message on terminal after filling all the fields:

Cannot save connection due to error: Invalid setting General: connection.interface-name: '': interface name must not be empty

There is also the same hint on the disabled Save button.

With this message in mind, I just found a workaround: click "Advanced", fill the Tunnel interface name with tun0, click Apply. There is also a bug here because even then the Save button is still disabled, but if you click "Advanced" again and Apply, the Save button is finally enabled and you can Save the connection.

I do not know why the tunnel interface would be required and if it really is, this field should be placed in the main form, not in the advanced window. However, I guess it should be still an optional field.

The workaround is possible, on Ubuntu Gnome, only by editing the connection with Advanced Network Configuration (nm-connection-editor) and not the main Gnome Settings application.