/lib/partman/update.d/80visual 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
dev=$1
num=$2
id=$3
size=$4
type=$5
fs=$6
path=$7
shift; shift; shift; shift; shift; shift; shift
name=$*
cd $dev
mkdir -p $id
for v in /lib/partman/visual.d/*; do
[ -x "$v" ] || continue
$v $dev $num $id $size $type $fs $path $name
printf '${!TAB}'
done >$id/view
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