I am new to Ubuntu. Have installed 12.04 on a slave drive while I migrate. Usually booting into Ubuntu goes without a hitch but recently I often find I am unable to use the keyboard, and log-in using the on-screen KB. Sometimes if I remove the USB jack & re-connect it will start working again but not always. I do have an old PS/2 KB which I am using at the moment but.......has anyone any ideas on how to get the USB KB reliably connected? Thanks Dave