Interesting, thanks for the info. This leads me to another question. I am a recent linux (animux, debian) convert, and i figured that for some hotkeys you have to additonally press the command/windows key. What is Alt+Space in windows, is Win+Alt+Space in linux. I am using Xfce.
I cannot remember the name for sure, but there is certainly some sort of shortcut key editor in XFCE. Perhaps it is in the Keyboard Preferences? Unlike Windows, the major desktop environments are very configurable when it comes to shortcut keys.