Fedora Live USB with GRUB

As already mentioned in my last post, my laptop won’t boot from a USB stick prepared using a binary copy of an ISO (by means of dd). Here is the method I use to boot the Fedora Live images off my USB stick using GNU GRUB2. The device node of the USB driver is denoted /dev/sdX in the following and must be replaced with the actual device node (e.g. /dev/sdc).

  1. Prepare a partition on the USB stick and/or make sure there is enough space on it (it must be slightly larger than the ISO image).
  2. Make sure it is flagged bootable. ( fdisk -l /dev/sdX is your friend)
  3. Remember the name of the USB partition you’re going to use or if unlabelled, label it.
  4. Loop-mount the ISO image using something like mount -o loop /path/to/iso /mnt/loop
  5. Copy the content of the ISO over to the USB
  6. Install GRUB on the USB by issuing grub-install --no-floppy --root-directory=/mnt/usb /dev/sdX
  7. Create a /mnt/usb/boot/grub/grub.cfg with the following content
    menuentry "Fedora Live" {
     linux /isolinux/vmlinuz0 root=live:LABEL=XYZ rootfstype=auto ro liveimg quiet  rhgb rd_NO_LUKS rd_NO_MD rd_NO_DM
     initrd /isolinux/initrd0.img
    }
    
    menuentry "Fedora Live (Basic Video)" {
     linux /isolinux/vmlinuz0 root=live:LABEL=XYZ rootfstype=auto ro liveimg quiet  rhgb rd_NO_LUKS rd_NO_MD rd_NO_DM xdriver=vesa nomodeset
     initrd /isolinux/initrd0.img
    }

    where XYZ must be replaced by the actual partition name of your USB partition.

  8. Unmount and boot

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