In case you are wondering which brand and model keyboard saw a need to plug the roll up PS/2 keyboard when the enter key wouldn't work when first going to install not simply boot live as done on previous occasions but actually go to install the latest 64bit release of ubuntu 8.10 as well as seeing the same problem when trying to custom install Mandriva 2009 and boot up with GParted live have a look at a poorly made cordless usb model Logitech puts out!
http://www.newegg.com/Product/Produc...82E16823126033
Before Vista came out even MS usb models simply couldn't get past the press F8 if you agree part when installing or reinstalling XP. You never know when any old cheapie PS/2 keyboard will come in handy when your regular one suddenly isn't seen by whatever as being present.