disable the appmenu indicator in Unity for all applications

If you want to disable the Appmenu (Global Menu) for all the applications in Unity, run the following commands:

sudo su
echo "export UBUNTU_MENUPROXY=0" > /etc/X11/Xsession.d/81ubuntumenuproxy
Then restart your computer.



If you want to re-enable the AppMenu, simply remove the /etc/X11/Xsession.d/81ubuntumenuproxy file:

sudo rm /etc/X11/Xsession.d/81ubuntumenuproxy
Then restart your computer.

You can also remove the AppMenu (but this might also remove the ubuntu-desktop meta package) if the above tweak doesn't work:

sudo apt-get remove appmenu-gtk indicator-applet-appmenu indicator-appmenu

If you've removed it, install it back:
sudo apt-get install appmenu-gtk indicator-applet-appmenu indicator-appmenu