README for sysv-rc
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Policy requires that maintainer scripts use update-rc.d to register and
deregister initscripts.  An unfortunate result of this policy, combined
with shortcomings in current update-rc.d implementations, is that there
is no way for maintainer scripts to change the sequence number of an
initscript that has already been registered if and only if its sequence
number has not been changed by the administrator.  update-rc.d *never*
changes the sequence number of an already registered initscript, even
if its sequence number has not been changed by the administrator.
There are no plans to fix this problem.  Therefore, if it is necessary
to change the sequence number of an initscript in order to fix a bug
then the maintainer script should go ahead and do:

    update-rc.d -f <scriptname> remove

before the new update-rc.d call, even though this overrides out any
administrator changes.