Flash drives are used as bootable devices for installing operating systems quite often. But it would be very good to have more than one operating system on a flash drive. Let’s say several different Linux distributions, or even a multiboot USB pen drive with Windows and Linux. It’s possible.
In today’s article, we’ll look at how to create a dual bootable USB stick with Ubuntu Linux 17.04 and Windows 10 operation systems. With WinUSB you don’t need to look Ubuntu ISOs in Internet, because WinUSB can download Ubuntu Server, Desktop and Kylin ISOs automatically, but of course you may download last version of distribution from Ubuntu official web-site yourself and burn it to your flash drive using WinUSB.
If you don’t have a Windows ISO or DVD, read here how to download Windows 10 ISO from Microsoft website.

Ok, when you are ready, you need to download and run WinUSB.

Download WinUSB
Select USB flash drive, which should be bootable

First you need to select the USB drive that you want to make bootable for Ubuntu and Windows.

When it will be plugged, WinUSB will detect it automatically and show in combo-box. The upper horizontal line below of USB stick name represents the ratio of free and used space. The second line represents a space on drive required to make it bootable with selected Windows and Ubuntu distributions.

Choose Windows and Ubuntu distributions

To select Windows distribution you need find it in standard dialog that will be opened by click one of the round buttons – ISO or DVD, depending on the type of distribution that you have, you can see buttons on screenshot above. After selection, it will be displayed in the application as shown in the screenshot below. Note, that you can set the name of boot menu point for this distribution on the small dialog shown below.

To select Ubuntu ISO the first you need to click “Other Boot loaders” button than choose Ubuntu redaction that you want add your multiboot USB drive like it shown on screenshot below. If you want WinUSB to download Ubuntu distribution automatically then place mouse pointer on necessary redaction than click on button with processor architecture – 32 or 64 bit. For examlple look on second screenshot below, where cursor placed on Desktop redaction. Note, that WinUSB will automatically download Ubuntu version 17.04.
If you have your own Ubuntu distribution, then, of cource, you can use it by click “Ubuntu ISO file” icon, chose ISO in file open dialog, and WinUSB will create bootable USB stick with it.
Ok, when Ubuntu ISO that you want to burn on USB are selected, you’ll see something like screenshot below. Just click “Next” button to select USB drive format mode.

Select format option

WinUSB propose some option to create a bootable USB drive. If there is enough USB stick free space, WinUSB will prompt you to make it bootable without formatting as shown bellow in the screenshot on the left.

If the space is not enough, WinUSB will offers you either to perform pre-formatting, or cancel it by pressing the “Back” button, free up enough space on the flash drive, and then come back to work option screen. Application will automatically detect the release of the space and will propose to continue without formatting. Note, don’t ask WinUSB format to fat32 USB drive bigger than 32Gb!