/lib/partman/free_space/70autopartition/choices is in ubiquity 2.18.7.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | #!/bin/sh
. /lib/partman/lib/base.sh
dev=$1
id=$2
cd $dev
open_dialog PARTITION_INFO $id
read_line x1 id x2 type x3 x4 x5
close_dialog
[ "$id" ] || exit 0
case "$type" in
primary|logical|pri/log)
db_metaget partman-auto/text/auto_free_space description
printf "auto\t${RET}\n"
;;
esac
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