Problem in 13.10: Keyboard layout problem: Control L and Caps Lock swapped

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I have a problem in UbuntuGNOME 13.10 which I didn't had in prior
releases: I did a clean install and I don't know if it was already there
or if I may have changed something, but my "Control L" and "Caps Lock"
keys are swapped. How to swap them back? See also the attached image.

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OpenPGP key: https://keyserver2.pgp.com/vkd/DownloadKey.event?keyid=0xCDDFDD67A48E0139

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