I made an USB drive with ubuntu-12.04.2-desktop-amd64.iso.
I start the instalation and after some minutes the PC stops and the USB drive is no more read.
The USB Drive is correctly made since i tried it on an another PC and works very well, in both mode (run without instal, and with instal).
I do not have any protection in the HDD or BIOS.
The PC is an DELL LATITUDE E6430
What is the problem?