The form validation seems buggy and there is a required field ("interface name") which was not required before. It is in the "Advanced" window.

There is a GUI workaround. Instead of editing the connection with the main Gnome Settings application, you have to do the following:

1. Launch Advanced Network Configuration (or run nm-connection-editor from terminal)


2. Click the "+" (Add a new connection), choose "Cisco Compatible VPN (vpnc)", click "Create..."


3. Fill all the fields


4. Click the "Advanced..." button


5. Fill "Tunnel interface name" with tun0


6. Click "Apply"


7. The Save button will still be disabled. Click "Advanced..." again and "Apply".


8. Finally, you will be able to "Save"!

This is tested on Ubuntu 22.04, Lubuntu 22.04, Pop!_OS 22.04, all with network-manager-vpnc-gnome version 1.2.8-2.

Bug reports on this issue already open in each project:

• GNOME


• NetworkManager


• Ubuntu