Comment 15 for bug 1028972

Here's a workaround until indicator-session is fixed: Copy the attached file to /usr/share/applications/. This will add a "Log Out" entry to your unity dash / menu->system. You can even copy the file to your users' desktops.

Note: The menu entry will automagically get translated to your locale's language, don't ask be how they do it, it's the magic of gnomes you know...

(Credits: http://askubuntu.com/questions/126909/how-to-get-the-shutdown-restart-icon-back-in-dash)