But when I started using it, I encountered one (big) problem, by pressing the "d" key, all my windows minimizes and the desktop was shown. Well, for those of us who live more in a terminal window, that could be a real problem.
I've tried two solutions, I don't exactly know which of them worked (maybe both of them), but as I google it for a solution, many people seem to solve the problem with either one of them, i will include both situations here:
1 - Change in System Preferences
- Go to System-->Preferences->Keyboard Shortcuts
- Find the entry "Hide all normal windows and set focus to the desktop"
- Here, change the default value (the d letter) or disable it (that's what I did)
2 - Change with gconf-editor
- Open a terminal windows
- Write gconf-editor to launch the program
- Go to app --> metacity --> global key binding
- Find the "show_desktop" option
- Change the value to a different key combination or "disabled"it.
- Close and restart (I think it is mandatory)
Well, that's all for now. I hope it would be helpful for others, too.
Reference: Ubuntu Forum

