/lib/partman/visual.d/20bootable 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 | #!/bin/sh
cd $1
num=$2
id=$3
size=$4
type=$5
fs=$6
path=$7
name=$8
if [ -f $id/bootable ]; then
printf "B"
fi
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