This file is indexed.

/usr/bin/kubuntu-devel-release-upgrade is in ubuntu-release-upgrader-qt 1:16.04.12.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
kdesudo "do-release-upgrade -m desktop -f DistUpgradeViewKDE -d"