After installing latest eclipse in Ubuntu 13.10 most probably you might experience a problem with the eclipse global menu bar.
Menu doesn't show it's contents. Editing eclipse.desktop file will fix this. But it won't give the global menu.
Go to the /usr/share/applications directory which contains the eclipse.desktop
sudo cd /user/share/applicatoins
sudo gedit eclipse.desktop
It would contain something like this.
################################## [Desktop Entry]
Name=Eclipse
Type=Application
Exec=/opt/eclipse/eclipse
Terminal=false
Exec=env UBUNTU_MENUPROXY=0 /opt/eclipse/eclipse
Icon=/opt/eclipse/icon.xpm
Comment=Integrated Development Environment
NoDisplay=false
Categories=Development;IDE
Name[en]=eclipse.desktop
##################################
This row will do the trick. If your eclipse.desktop doesn't contain it add it and save.
Exec=env UBUNTU_MENUPROXY=0 /opt/eclipse/eclipse
/opt/eclipse/eclipse should be replaced with what ever your Exec(Exec=/opt/eclipse/eclipse in my eclipse.desktop ) is equal to.
Then you are done :)