/etc/init/checkroot-bootclean.sh.conf is in mountall 2.53.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # checkroot-bootclean.sh - compatibility job for sysvinit dependencies
#
# Dummy job to prevent checkroot-bootclean.sh from being run on upstart
# systems. This is a pointless script that should be removed from sysvinit.
start on mounted MOUNTPOINT=/
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