If you are not having menu bar that is having multiple options like: File, Edit, View, Help etc. on the top of the your windows then this article is for you.
Here are the screenshots:
Pointer over window:
Pointer over menu bar:
You can see the empty title menu bar. There are no options like file, edit, view etc.
So open Terminal (Ctrl+Alt+T) and copy paste these commands one by one:
sudo apt-get update && sudo apt-get install --reinstall indicator-appmenu
Next, reload everything:
dconf reset -f /org/compiz/ && unity --reset-icons &disown
If not working, then try this command too:
sudo apt-get install --reinstall unity ubuntu-desktop
Better Restart your system once after trying these commands: