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(yes, that's a command, not a directory)
update-rc.d apache2 stop 91 2 3 4 5 .
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... but the man page says to use sysv-rc-conf or bum
update-rc.d apache2 stop 91 2 3 4 5 .
I'm not sure what the final . is for. The man page just says to put it there, not why.
People on IRC will tell you to use update-rc.d, but the man page says it's not meant for sysadmins and you should use an editor like sysv-rc-conf or bum.