re-format USB in Ubuntu 16.04

Ubuntu 16.04 re-format USB drive which store bootable installer such as Windows 10 install usb or Ubuntu 16.04 Desktop install usb

You can use the terminal:

1. Find device ID:

df -h

2. Now unmount the device:

sudo umount /dev/sdb1

(change sdb1 with your device id)

3.Format USB

Choose a file system:

Ext4

sudo mkfs.ext4 /dev/sdb1

Fat

sudo mkfs.vfat /dev/sdb1

Ntfs

sudo mkfs.ntfs /dev/sdb1