How to Create Uefi Bootable Iso?
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...
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?
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
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:
Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.
