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We need to create a boot圆4.efi to make sure the USB is bootable on a UEFI platform. We now should create separate directories to mount these two partitions and copy over the ISO image files into OS-Images partition which should look very similar to the following layout. We have created an ext4 filesystem partition named OS-Images for ISO image files because fat32 has a maximum file size limit of 4GB. Number Start End Size File system Name Flags Sector size (logical/physical): 512B/512B We may refer to the following partition layout as an example. We need to create the USB stick's partition table as gpt format and further make two partitions. Finally, we need to have a working linux distribution to work on which currently I'm using Ubuntu 18.04.2 demoing this tutorial. Secondly, we need to use a UEFI compatible system to avoid issues and maximize flexibility. Since we need to boot multiple ISO image files directly from USB, we do really need a large USB stick. If the distribution is bootable through the CD-ROM drivers and the CD or DVD media is not writable, which it effectively means that we can actually boot from the non-writable iso image file as well. The iso image format is known for its original design for CD disks or DVD disks so that the distributions are bootable through your CD-ROM drivers.
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However, grub actually enables us to boot most of the linux distributions through loop format or iso image files. However, it is always so annoying to re-flush the usb stick again and again. Sometimes we need to create multiple linux distribution installation media or bootable usb stick.
#DOWNLOAD GRUB BOOTLOADER ISO HOW TO#
Last time we've talked about how to Manually UEFI Boot Linux and Windows 10 USB from Grub, today we'd like to talk about creating a multi-boot usb stick with grub 2.