7th October 2016, 19:48
I guess you checked the SHA256sum/md5 sum of the ISO to make sure it isn't damaged ?
If yes and the problem still occurs maybe try a different usb stick (there are some u3 sticks that have a small part recognized as cdrom drive and they tend to confuse linux live systems when it comes to booting) or a different usb port (especially try switching between USB 3 to 2 or the other way around when you have those two on this machine)
If yes and the problem still occurs maybe try a different usb stick (there are some u3 sticks that have a small part recognized as cdrom drive and they tend to confuse linux live systems when it comes to booting) or a different usb port (especially try switching between USB 3 to 2 or the other way around when you have those two on this machine)