一、查看u盘的设备名称

topeet@ubuntu:~/Android$ sudo fdisk -l
Disk /dev/sda: 161.1 GB,161061273600 bytes
255 heads,63 sectors/track,19581 cylinders,total 314572800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000675b5

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048   301989887   150993920   83  Linux
/dev/sda2       301989888   314572799     6291456   82  Linux swap / Solaris

Disk /dev/sdb: 1966 MB,1966080000 bytes
255 heads,239 cylinders,total 3840000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x01dfe2ef

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *        2048     3839999     1918976    6  FAT16




二、输入写镜像的命令到/dev/sdb


topeet@ubuntu:~/Android$ sudo dd if=./ubuntu-14.04.5-desktop-amd64.iso of=/dev/sdb bs=4M
263+1 records in
263+1 records out
1104052224 bytes (1.1 GB) copied,208.182 s,5.3 MB/s