The appmenu (also known as the global menu) in Ubuntu Oneiric can be both a useful and annoying feature. If you have a large screen, having to move your mouse to the top of the screen every time you want to access the menu can be annoying.
For those who wish to remove the appmenu, simply remove the appmenu app with the following command:
sudo apt-get autoremove appmenu-gtk appmenu-gtk3 appmenu-qt
Restart the PC. Your menu bar should stick to the top of your application window now.
If you are using Firefox, you will notice the above method will not work. This is because Oneiric is using a Firefox extension to enable the global menu effect.
1. In your Firefox, go to “Tools -> Add-ons -> Extensions”. Disable the “Global Menu Bar Integration” extension (You can’t un-install it).
2. Restart Firefox. The Firefox menu bar should stick to the application window now.
To re-enable the appmenu, all you have to do is to re-install the appmenu packages.
sudo apt-get install appmenu-gtk appmenu-gtk3 appmenu-qt
and restart your computer. Dont't forget to reenable it in Firefox again!