/usr/share/dell/casper/seeds/dual.seed is in dell-recovery 1.31.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# <dual.seed>
#
# Dell dual-boot preseed that stacks on ubuntu.seed
# * Last updated for Ubuntu 10.04
#
# Copyright 2010 Dell Inc.
# Mario Limonciello <Mario_Limonciello@Dell.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#Special dual boot partitioning
d-i partman-auto/expert_recipe string \
\
dell :: \
\
500 10000 4000000 ext4 \
$primary{ } \
method{ format } \
format{ } \
use_filesystem{ } \
filesystem{ ext4 } \
mountpoint{ / } .
### Dell Factory Process specific
#These control what partitions are deleted initially
d-i dell-recovery/os_partition string 4
d-i dell-recovery/swap_partition string
#This controls whether dell-recovery, dell-oobe, and dell-eula get installed
d-i dell-recovery/dual_boot boolean true
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