Customize alternate install CD with UEFI?

Josef Wolf jw at
Wed Jul 20 17:04:07 UTC 2016

On Wed, Jul 20, 2016 at 03:57:56PM +0200, Liam Proven wrote:
> On 20 July 2016 at 09:52, Josef Wolf <jw at> wrote:
> > ubuntu-16.04-server-amd64.iso
> > According to I
> > need the isolinux/efiboot.img file to make this iso bootable with UEFI.
> >
> > But there is no such file on the original ubuntu install CD. Where do I get
> > it?
> Are you sure?

I've found it now: it is in boot/grub/efi.img

The next question is, how to customize it? For the traditiona BIOS, I gave
isolinux the following line to start preseeding:

  append  debian-installer/locale=de_DE.UTF-8 console-setup/ask_detect=false \
          keyboard-configuration/layoutcode=de \
          keyboard-configuration/variantcode=nodeadkeys \
          file=/cdrom/preseed/s-test.seed \
          initrd=/install/initrd.gz quiet DEBCONF_DEBUG=5 --

How would I give this information to the EFI system? I see, efi.img is a
mountable image. But when I mount it, I can't find any configuration files on

> > While at it: the partitioner on ubuntu-16.04-server-amd64.iso don't seem to be
> > aware of the UEFI partitions?
> There are no such things as UEFI partitions as such.

Well, there are
- ESP (Efi partition)
- MSR (Microsoft reserved)
- MS recovery environment (seems to be Windows related)
- Win recovery environment (looks like Windows related, too)

The recommendation by the partitioner is to wipe all of those.

BTW: When the EFI-installer starts, the partition /dev/sda (is this the EFI
partition) is already mounted and the installer complains that it is mounted.

Josef Wolf
jw at

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