Comment 16 for bug 287428

Several users having this problem report a keyboard layout of 'thinkpad60' in their xprop output. In intrepid and beyond, you should be using the generic 'evdev' keyboard layout instead, configurable under System->Preferences->Keyboard Layouts: Keyboard Model. Other values for Keyboard Model are possible, but are incorrect for recent kernels and should be avoided.

On a ThinkPad X61 configured to use the 'evdev' model, the Menu key works fine here.