This suppresses:
Partition disks
---------------
This machine's firmware has started the installer in UEFI mode but it looks
like there may be existing operating systems already installed using "BIOS
compatibility mode". If you continue to install Debian in UEFI mode, it might
be difficult to reboot the machine into any BIOS-mode operating systems later.
If you wish to install in UEFI mode and don't care about keeping the ability to
boot one of the existing systems, you have the option to force that here. If
you wish to keep the option to boot an existing operating system, you should
choose NOT to force UEFI installation here.
Force UEFI installation?
1: Yes 2: No
Prompt: '?' for help>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
d-i partman-ext3/no_mount_point boolean false
d-i partman-basicmethods/method_only boolean false
+d-i partman-efi/non_efi_system true
d-i partman-auto/expert_recipe string \\
boot-root :: \\