I used a usb to put 12.10 on a dell laptop. Everything is working fine. I used the same usb to put it on a dell desktop. Ubuntu is not working well on the desktop and in settings, claims to be the laptop (system settings). I would like to know how to make it reset. I think that it has graphics settings it picked up from the laptop installation. What should I do?
A persistent live usb will retain settings from your install. If you are not sure how to change the settings to what you need, the simplest thing would be to remake the usb, being sure to reformat the drive at the same time.