That's an old report and some comment states it's fixed with the patches from https://bugzilla.gnome.org/show_bug.cgi?id=597839 which are in Ubuntu versions newer than 16.04.
Closing that report it's confusing as this point since it has comment from users having different issues. If anyone can still reproduce on 18.04 or newer please report a new bug using 'ubuntu-bug network-manager' ** Bug watch added: bugzilla.gnome.org/ #597839 https://bugzilla.gnome.org/show_bug.cgi?id=597839 ** Changed in: network-manager-applet (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Network- manager, which is subscribed to Network Manager Applet. https://bugs.launchpad.net/bugs/1542733 Title: Connect to Hidden Wi-Fi Network, "Connect" grayed out To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager-applet/+bug/1542733/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop