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I'd forget about messing around with console commands and X configuration files, and just change the keyboard layout in the GNOME Settings panel: You can access this by hitting the Windows key a...
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#1: Initial revision
I'd forget about messing around with console commands and X configuration files, and just change the keyboard layout in the GNOME Settings panel:  You can access this by hitting the Windows key and typing "keyboard", at which point you can select Settings -> Keyboard in the Activities overview window. You can use the `+` button at the bottom to add new layouts, and the vertical `...` buttons to remove unwanted layouts. It seems that by default the `+` button only lists other English layouts if the main language is English, but you can scroll down and choose `Other` if you want the full list of available layouts to appear (including `French (AZERTY)` as I have chosen in the image). Note that I'm using Ubuntu, but I assume that GNOME on Arch behaves the same way — this configuration dialog is a GNOME feature, not something specific to the distribution (unless the distro has done something weird with their GNOME build).