1. use English (UK, Macintosh) as the base keyboard layout

2. https://help.ubuntu.com/community/AppleKeyboard#Ubuntu_11.10_up_to_recent (steps 1,2,3) to fix wrong keys (§± and `~)

3. dconf-editor org.gnome.desktop.input-sources.xkb-options ~> ['lv3:lalt_switch', 'lv3:ralt_alt']

4. compizconfig-settings-manager (ccsm)

        desktop > ubuntu unity plugin > general > key to show the menu bar:     
        ~> disabled

        desktop > ubuntu unity plugin > launcher > key to show the dash, launcher and help overlay:      
        ~> disabled

        desktop > ubuntu unity plugin > launcher > key to start the launcher application switcher:      
        ~> <Control>space

        desktop > ubuntu unity plugin > switcher > key to start the switcher:           
        ~> <Super>Tab

        window management > move window:                                        
        ~> <Super>Button

5. Settings > Keyboard > Shortcuts Launch Terminal ~> Ctrl+Super+T

Useful resources:

• man xkeyboard-config