Hello,
I've been searching for this problem through Web, but could not find any solution. It is kinda weird. I have Ubuntu 14.04 and installed Gnome Session Fallback because I like Gnome classic more than unity. I use Gnome Metacity as manager and everything works fine, except that I can't use shortcut to show desktop (super + d does not work, nor ctrl + alt + d, or alt + d, etc...). However, alt+tab works to switch apps, ctrl+alt+arrows works to switch workspace, etc... Everything seems fine, except show desktop shortcut. When I go to system preferences > keyboard > keyboard shortcuts, there is no "Navigation" menu so that I can configure a shortcut to "show desktop".
Anyone can help me out?
Thanks in advance.
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