I am trying to customize ubuntu-14.04.2-server-amd64.iso, but I am unable to make it uefi bootable.

First I tried with original iso file:

dd if=/path/to/iso/ubuntu-14.04.2-server-amd64.iso of=/dev/sdc bs=16M

Everything is good at this point - I can boot flash in UEFI.

I have extracted iso content to /path/to/tmp folder and then I am trying to re-create iso (right now unmodified), but new iso does not work with uefi.

I am re-creating iso with this command:

mkisofs -r -V "Custom Ubuntu Install CD" -cache-inodes \ -J -l -b isolinux/isolinux.bin -c isolinux/boot.cat \ -no-emul-boot -boot-load-size 4 -boot-info-table \ -eltorito-alt-boot -e boot/grub/efi.img -no-emul-boot \ -o /path/to/tmp.iso /path/to/tmp

Then I am using same dd command to put new iso on usb. What is right command to make it uefi bootable?

3

2 Answers

You could use xorriso. I don't remember why but I think this is not possible with mkisofs.

Try:

xorriso -as mkisofs \ -isohybrid-mbr /usr/lib/syslinux/mbr/isohdpfx.bin \ -c isolinux/boot.cat \ -b isolinux/isolinux.bin \ -no-emul-boot \ -boot-load-size 4 \ -boot-info-table \ -eltorito-alt-boot \ -e boot/grub/efi.img \ -no-emul-boot \ -isohybrid-gpt-basdat \ -o /path/to/tmp.iso \ /path/to/tmp

This will produce an hybrid MBR/EFI iso

4

You can create a small (2,8 MB floppy) UEFI disc with:

mkfs.msdos -C /tmp/uefi.iso 2880
sudo mount /tmp/uefi.iso /mnt
sudo cp /tmp/your_uefi_files/* /mnt/
sudo umount /mnt

Then reboot your system, press ESC or F10 or F11 and choose UEFI shell. To switch to the UEFI filesystem type:

fs0:

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