Ubuntu’s Unity interface greatly resembles that of MacOSX, and that includes T__he Global menu, AKA The Mac Menu, _which shows the _Application menu(File, View, Edit, e.t.c.) in the top bar.
Macbuntu, an Ubuntu to MacOSX Transformation pack, _which i was so tempted to try, didnt work too well for me, and thus I uninstalled it. Yet, it left the scars; in this case, by permanently messing up the _global menu.
This is how i fixed it. (terminal):
sudo apt-get install appmenu-gtk appmenu-gtk3 appmenu-qt indicator-appmenu