I am going to make my situation as concise as possible.
I have a Dell Optiplex755 refurbished that I bought recently. I did a clean install of Kubuntu 12.04 64-bit (all updates done) with no other OS on the system.
The issue I am having is that my Sejin IR Wireless Keyboard with Trackball connected to the computer via a PS/2 - USB Dual Adapter stops working.
What is strange is that the integrated trackball still works but the keyboard is useless. I also have a wireless mouse attached via USB if this helps in any way.
The same setup worked flawlessly on a Dell Dimensions3000. The only difference is that the keyboard was connected via a PS/2 interface with no USB adapter.
So far if I unplug and re-plug the USB adapter I get the keyboard working again. But this is not a valid solution and I hope to be able to sort this out in another fashion that won’t require me to physically reset the USB connection ever so often.