sudo bash echo "export UBUNTU_MENUPROXY=0" > /etc/X11/Xsession.d/81ubuntumenuproxy
This is the only thing that will disable the appmenu for libreoffice
sudo apt-get remove appmenu-gtk appmenu-gtk3 appmenu-qt indicator-appmenu
sudo apt-get install appmenu-gtk appmenu-gtk3 appmenu-qt indicator-appmenu