Bug#664178: upgrade-reports: Laptop doesn't recognise an usb keyboard before booting

[Max Sievers <mms@max-sievers.name>]

I just realised that I can use the usb keyboard in the boot selection sreen of 
GRUB but I can't use it to type in the password for my encrypted disk (later 
in the boot process). After booting the usb keyboard works again.