/usr/lib/lsb/remove_initd is in lsb-compat 9.20161125.
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 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49  | #!/usr/bin/python3
import sys, re, os, initdutils
if len(sys.argv) > 1:
    initfile = sys.argv[1]
    # If the absolute path isn't specified, assume it's relative to
    # cwd; if that doesn't exist, try /etc/init.d
    ap = os.path.abspath(initfile)
    if os.path.exists(ap):
        initfile = ap
    else:
        initfile = os.path.join('/etc/init.d', initfile)
else:
    print('Usage: %s /etc/init.d/<init-script>' % sys.argv[0], file=sys.stderr)
    sys.exit(1)
headers = initdutils.scan_initfile(initfile)
provides = headers.get('Provides')
if provides:
    facilities = initdutils.load_facilities()
    depends = initdutils.load_depends()
    for facility in provides:
        if facility in facilities:
            entries = {}
            for entry in facilities[facility].items():
                if entry[0] != initfile:
                    entries[entry[0]] = entry[1]
            facilities[facility] = entries
    for (initscript, needed) in depends.items():
        for facility in needed:
            if facility[0] == "$":
                continue
            if not facilities.get(facility) and facility in provides:
                print('Unable to remove %s: %s needs %s\n' % (
                    initfile, initscript, facility), file=sys.stderr)
                sys.exit(1)
    if initfile in depends:
        del depends[initfile]
        initdutils.save_depends(depends)
    initdutils.save_facilities(facilities)
initfile = initfile.replace('/etc/init.d/', '')
os.system('/usr/sbin/update-rc.d -f %s remove' % initfile)
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