I have been using Ubuntu and other distro's for years, but I have never had such difficulty trying to install it for a friend. I am trying to install Ubuntu 12.04 from Live USB to an HP Mini 210-1036VU netbook but I am getting faulty medium errors. I have tried another USB drive, alternate install, using USB creator and Unetbootin from two different computers and different release image versions (12.04.01, 12.04.02 etc) & all to the same end! On the HP Mini the disk check boot mode gives one error. It's clean on my own laptop and image checksums are matched. Should I try booting from an external disk drive? Is there possibly some discreet limitation to booting from a USB drive on this computer? Hardware drivers? I haven't found the same problem in forums yet. I'll try to provide more data on request.
First, just to make sure you are using the latest Unetbootin and not older versions. personally I don't unetbootin. I use rufus (http://rufus.akeo.ie/) cuz it's faster and seems like a better tool. Sometimes these tools need custom-scripts written for the installation of newer linux iso image because not all iso image are created equal.
Can you boot up (not install) that live-usb drive on a regular desktop?
btw, sometimes you can install a linux distro onto a computer with a bootable usb image but you cannot boot up its live-usb image to test run it because live-usb has a different setup script than a regular bootable usb image.
also, which hp mini netbook do you have?
this may help: https://wiki.ubuntu.com/HardwareSupport/Machines/Netbooks
I've been just as frustrated as you before, and as it turns out, I had failed to check BIOS.
You didn't mention you've checked BIOS, so maybe checked that?
I hope this was useful :-)