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I have created a custom iso and I followed the instructions to make the iso from a wiki article from ubuntu with the following command: 

mkisofs -D -r -V "CUSTOM_UBUNTU" -cache-inodes -J -l -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -o /tmp/ubuntu16-desktop-unattended-install.iso /opt/isodir

The iso does work, I tested on Oracle VM and I was able to boot from it, but when I created an image on a USB, I cannot boot from the usb at all. Did I miss something? how can I create the iso to be able to boot from the USB? is it missing some UEFI/EFI directives?

user3311890
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  • Really can not tell from what little you posted and support for custom .iso is limited at best. – Panther Jul 18 '17 at 16:46
  • I created the iso, it boots on Oracle VM but it wont boot from a USB flash drive for example, wonder if I missed an option or something or if UEFI/EFI does not recognize the format/options? – user3311890 Jul 18 '17 at 17:07
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    What error do you get? How did you set your BIOS? What sort of google search did you do ? https://askubuntu.com/questions/457528/how-do-i-create-an-efi-bootable-iso-of-a-customized-version-of-ubuntu – Panther Jul 18 '17 at 17:26
  • no errors, the iso can boot on oracle vm, I know how to create bootable usb images, I can install the original iso on a usb and run it on my laptop. Is just this custom iso that gave me problems, guess is missing something or the way mkisofs creates the iso, is not readable by a physical hardware. – user3311890 Jul 18 '17 at 19:09
  • I can not tell from what you have posted. – Panther Jul 18 '17 at 19:10
  • From https://askubuntu.com/questions/457528/how-do-i-create-an-efi-bootable-iso-of-a-customized-version-of-ubuntu mkisofs -U -A "Custom1404" -V "Custom1404" -volset "Custom1404" -J -joliet-long -r -v -T -o ../Custom1404.iso -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 – Panther Jul 18 '17 at 19:12
  • You haven't noted two critical details: (1) How did you copy the .iso file to a USB flash drive, and (2) are you trying to boot in BIOS/CSM/legacy mode or in EFI/UEFI mode? Depending on the answers to those questions, there may be others, like what (if anything) is in the EFI/BOOT directory on the resulting USB drive and what filesystem it uses. If you don't care about the .iso disc, then you're probably better off creating a bootable USB disk directly. – Rod Smith Jul 19 '17 at 01:21

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