/lib/partman/update.d/20bootable is in ubiquity 18.04.14.
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 22 23 24 25 26 27 28 29 30 31 32 33 34 | #!/bin/sh
. /lib/partman/lib/base.sh
dev=$1
num=$2
id=$3
size=$4
type=$5
fs=$6
path=$7
name=$8
cd $dev
if [ $fs = free ]; then
rm -f $id/bootable
else
bootable=no
open_dialog GET_FLAGS $id
while { read_line flag; [ "$flag" ]; }; do
if [ "$flag" = boot ]; then
bootable=yes
fi
done
close_dialog
if [ $bootable = yes ]; then
mkdir -p $id
>$id/bootable
else
rm -f $id/bootable
fi
fi
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