There are two different boot methods in use today on x86-64 platforms, the modern EFI and legacy BIOS boot. The location where the bootloader is stored is dependent on the method used by the firmware to boot the disk. It is stored on the disk in a specified location where the firmware can find it easily. The system firmware does not to know how to boot the operating system on the drive, and instead passes on that responsibility to a small program called the bootloader. Therefore, the system will not be able to boot from this disk. Tl dr When you recreate the ISO from the extracted files, you are not (correctly) transferring either the BIOS bootblock, nor the EFI System Partition, or ESP, to the newly created USB drive. If in UEFI mode on installed system, boot into the Target drive and run the above.Īnother method to make a bootable USB is to boot ISO files directlyīIOS/UEFI Template Image for Booting ISO Files Sudo grub-install -boot-directory=/mnt/boot /dev/sdx Install grub, if in BIOS mode or booted from USB drive run: sudo mount /dev/sdx2 /mnt
Linux /casper/vmlinuz file=/cdrom/preseed/ed boot=casper quiet splash - persistent Open the ISO's folder as Administrator, open the ISO using Archive Manager.Įxtract the ISO's contents to the Target's root partition.ĭrag and drop the boot and EFI folders from Archive Manager window to the EFI boot partition.Įdit sdx2/boot/grub/grub.cfg adding set root=(hd0,3) after the first line that starts with menuentry.Īdd a space and the word "persistent" after. Create an ext4 partition labeled casper-rw.Add an ext4 root partition large enough for the Ubuntu ISO's contents, (~ 3GB for 20.04).Add a 300MB FAT32 EFI boot partition next to it.Create a 1MB BIOS boot partition on the left, formatted as unformatted.Create a GPT partition table on Target USB.Making a Grub2 booter that uses Persistent partitions is easy.* The following method extracts the contents of the ISO to a partition There are many ways to make a Bootable USB Flash Drive
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