Comment 34 for bug 946406

Issue seems to be happening when you do (using 12.10 persistent media made with usb creator):
 - Boot media
 - Don't press any key, let it boot ubiquity
 - Choose a language like French and click on "Essayer Ubuntu"
 - Reboot the machine
 - When booting the media, enter gfxboot
 - Choose German and select Ubuntu ohne Installation ausprobieren
 - Let it boot
 - You'll get a session with a french keyboard layout instead of german (azerty vs qwertz)

The problem is the gsettings key set by ubiquity that's not cleared when reconfiguring the system wide keyboard setting.