[ubuntu] Changed keyboard from 105 to 86 key, can't log in

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http://ubuntuforums.org – I replaced the USB keyboard (105 keys) that I was using with a compact 86-key Sejin PS/2 keyboard. The PC BIOS has no problem with the Sejin, but Ubuntu assumes that I still have a 105-key keyboard attached and I can't log in (some keys produce no characters). I attached the USB keyboard and logged in. But I see no way to change the type of keyboard from the 105 to the small keyboard. (Hardware)