a USB flash drive or a micro SD a disk imager MIN 8GB There are various ways to write an OS on an external device. Here we will see how to do it with UNetbootin . or https://goo.gl/oCjtC2 >> UNetbootin << INSTRUCTIONS FOR INSTALLING UBUNTU OS ON WITH YOUR PC RUNNING WINDOWS 1 Write Ubuntu on your USB flash drive/micro SD using the disk imager UNetbootin When your USB flash drive/micro SD is written, unplug it Search the Ubuntu file on your computer Select the drive to which you want to install Ubuntu UNetbootin Diskimage ISO UbuntuISO\ubuntu-16.10... ... Space used to preserve files across reboots (Ubuntu only) 0 Type: USB drive Drive: D:\ OK Cancel MB D E Ubuntu 2 or https://goo.gl/dZR51D Ubuntu xx.xx 64bit Desktop Choose the following features A Ubuntu UNetbootin B Install UNetbootin on your computer, you will need it later on! 3 Insert the USB flash drive or the micro SD card into your computer Formatting Removable Disk Capacity 4GB 64GB File system FAT32 (Default) Allocation unit size 4096 bytes Close Start Once it appears, fill the formatting window as follows : Here should be written the size of your USB flash drive or micro SD card Choose the following elements A B C Format your USB flash drive or micro SD card > Open the File Explorer > Search the drive that you want to format > Click right on the drive > Choose « format » (D:) Format Scan it Scan it