/lib/partman/finish.d/25create_host_mountpoint 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 | #! /bin/sh
if [ -d /host ]; then
mkdir -p /target/host
mount --bind /host /target/host
fi
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