In Kali 2019.4 zenmap is no longer installed by default because it wasn’t maintained upstream so the package was dropped.
Installing “apt install zenmap” didn’t work as we see below.
So we need to download the zenmap .rpm on there website https://nmap.org/download.html
Next install “Alien” and convert the .rpm to a .deb file we can install with the dpkg command.
Convert .rpm to .deb
Final step is installing the created zenmap_7.80-2_all.deb file.
Zenmap should now be installed and available in the start menu.