I am trying to upgrade from 11.10 to 12.04. The machine is acer aspire core i3, 2.1ghz, ram 6gb, hard disk 500 gigabyte. I am using a usb stick with a downloaded 12.04 live install. The install progressed with an overwrite of 11.10 system files to 12.04 and then got stuck. The install is stuck at 'restoring previously installed packages' How can i recover from this situation ? please help.