Disabling or changing console switching keys

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http://unix.stackexchange.com – For some reasons on my Ubuntu 11.04 Natty running Linux 2.6.38-13, with an Italian layout for the keyboard, the keystrokes AltFx switch between virtual consoles (instead of the normal CtrlAltFx keys). What could I change to avoid that? I tried adding Section "Serverflags" Option "DontVTSwitch" "on" EndSection Section "InputClass" Identifier "keyboard defaults" MatchIsKeyboard "on" Option "XKbOptions" "srvrkeys:none" EndSection to the /etc/X11/xorg.conf file but to no avail. Is there an xmodmap setting that I could use? (HowTos)