Disabling Ubuntu's new Mac-like menubar

Ubuntu 11.04’s new menubar is a user interface disaster. Here’s one way I’ve found to turn it off:

echo 'unset UBUNTU\_MENUPROXY' >> /etc/X11/Xsession.d/81noappmenu

You can also probably remove /etc/X11/Xsession.d/80appmenu, but a package update will put it back.