U disk installs Ubuntu server 14.04 and no CD-ROM drive is detected error

U disk installation Ubuntu Server 14.04

1: Download the ISO image file for Ubuntu Server14

2: Download UltraISO u disk image making tool;

3: Use Ultra IOS to write the downloaded ISO system image file to the USB flash drive;

Write mode: http://jingyan.baidu.com/article/59703552e0a6e18fc007409f.html

4: After the write is successful, copy the iOS image to the U packing directory for the next copy

5: Use the USB stick to start the computer and start the installation;

6: Error encountered at this time: installation CD not detected, resulting in installation failure

7: Install page ALT + F2 into command line mode

8:ls dev/sdb* Find the current U-disk device

9: My device here is SDB4

10: Create a temporary space

mkdir USB

mkdir CDROM

11: Mount U-disk to USB directory

Mount-t Vfat/dev/sdb4/usb

12: Mount the system image to the CDROM directory

Mount-o loop-t iso9660 Ubuntuxxx.iso/cdrom

13: Exit command-line mode

14: Continue Installation

Reference: http://forum.ubuntu.org.cn/viewtopic.php?t=384666

U disk installs Ubuntu server 14.04 and no CD-ROM drive is detected error