I've discovered the problem. Instead of "network-manager-fortisslvpn", the package "network-manager-fortisslvpn-gnome" should be installed on Ubuntu 24.04, and everything works.
Apologize, I'm nothing but a stupid user :) Let's close this issue, thanks. ** Changed in: network-manager-fortisslvpn (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2078429 Title: VPN connection editor doesn't work on 24.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager-fortisslvpn/+bug/2078429/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs