*Download postman from https://www.getpostman.com/apps
*Enter command line and go to Downloads folder
sudo tar -xzf postman.tar.gz -C /opt rm postman.tar.gz sudo ln -s /opt/Postman/Postman /usr/bin/postman
*Create an Unity desktop file for Postman:
cat > ~/.local/share/applications/postman.desktop <<EOL [Desktop Entry] Encoding=UTF-8 Name=Postman Exec=postman Icon=/opt/Postman/resources/app/assets/icon.png Terminal=false Type=Application Categories=Development; EOL
Thanks to: https://blog.bluematador.com/posts/postman-how-to-install-on-ubuntu-1604/