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use English (UK, Macintosh) as the base keyboard layout 
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https://help.ubuntu.com/community/AppleKeyboard#Ubuntu_11.10_up_to_recent (steps 1,2,3) to fix wrong keys (§± and `~) 
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dconf-editor org.gnome.desktop.input-sources.xkb-options~>['lv3:lalt_switch', 'lv3:ralt_alt']
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compizconfig-settings-manager (ccsm) 
        desktop > ubuntu unity plugin > general > key to show the menu bar: