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This is a known bug in 16.04 which has no ultimate fix till now. But this command can solve the problem temporarily: initctl restart unity-panel-service
Have you used tweak-tool to change your theme? Try resetting to a default theme. I noticed the same issue, along with the fact that some windows (like gedit) couldn't be resized. As soon as I changed my GTK+ theme back to Adwaita (default) everything worked right. Do note, I run Gnome 3, so your mileage may vary.
I am going to go ahead and answer my own question, and hopefully this will help someone! Well, it turns out that if you hold down the power button for around a second, the menu comes up!
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