Before making the USB drive Startup disk, please format your USB flash drive first.
There are many kinds of tools to make the boot disk of U disk, we introduce you to make it with soft disc. All we need to have this software, if everyone does not can Baidu "soft disk pass", download install one. then click Open. Before making the startup disk, we need to prepare the relevant materials, and the material we are talking about here is the ISO file of Ubuntu 14.10.
1. After opening the soft disk pass, we click "Open", shown. Then select our Ubuntu iso file, as shown in:
2, in the pop-up bar, we select "Write hard disk image", as shown:
3, at this time, we will see the interface, we need to choose a "write method", we will write the way to "USB-HDD". Otherwise you make the U disk boot disk is not bootable. What we also need to do is to select "Write to new drive boot sector" in "Portable Boot" as "Syslinux".
4, then this time, there will be a prompt, you will be prompted whether to write this boot information to the U disk, we click "Yes". Wait for writing, such as:
5, after the completion of the write, we will see the information as shown, you are prompted to "burn successfully." We can click Back. Then we can start installing your Ubuntu.
Make an Ubuntu USB boot disk