The USB flash drive cannot start ubuntu.

I used UltraISO to burn a ubuntu to a USB flash drive last night. I wanted to start and install it with a USB flash drive. However, after the burning, I couldn't enter the startup interface. At that time, I was puzzled, later, I still couldn't use the universal usb installer. I burned ubuntu 11.04, and later I used ubuntu 10.04. I had to crash and accidentally see a solution to this problem, modify an object
 
Java code
1. After burning the file with UltralISO, find the "syslinux/syslinux. cfg" configuration file, open it, and find the following information:
Default vesamenu. c32
2. Add "#" in front of this statement to comment it out:
# Default vesamenu. c32
In this way, after the USB is restarted, it can be installed normally.
 
Just now, after the system was restarted, another error occurred: Invalided partition table, which was thought to be a partition error. Later, I checked that the BIOS was set to USB boot, I still inserted a mobile hard disk on my computer, and then removed the mobile hard disk. After restarting, I can re-enter the system, and pay attention to it later.