Here's the problem with gufw: its desktop file ( /usr/share/applications/gufw.desktop) includes this line near the bottom:
Code: Select all
OnlyShowIn=Unity;
Removing or commenting out that line allows it to show up under System: Firewall Configuration.
Why on earth Ubuntu had that line in there in the first place escapes me.
If there is any demand, we could put a fixed version in our community repo.