Install appmenu-qt by entering the following commands in the terminal:
sudo apt update sudo apt install appmenu-qt
Description:
application menu for Qt
appmenu provides you with an integrated application menu in your global menu bar . appmenu-qt will work for applications designed for Qt and KDE
Homepage: https://launchpad.net/appmenu-qt
Version: 0.2.7+14.04.20140305-0ubuntu2
Section: universe/x11