I was trying to install Ubuntu 12.10 from a live CD and I wasn't able to get it to recognize either my keyboard (C.Y.B.O.R.G V5) or my mouse (R.A.T 7). I eventually gave up but later on I was able to use an old keyboard that uses a serial port instead of a USB (which works). I was then able to install the OS but my mouse still won't work. I am unable to navigate with just the keyboard so I really don't know what to do.
Boot into BIOS configuration page and search for
USB Legacy Support and enable it.
Then try again with the Usb keyboard and mouse.