root@mainserver:~# update-rc.d apache2 remove
update-rc.d: using dependency based boot sequencing
root@mainserver:~# find /etc/ | grep -i rc | grep apache
root@mainserver:~# update-rc.d apache2 stop 0 6
update-rc.d: using dependency based boot sequencing
update-rc.d: warning: apache2 start runlevel arguments (none) do not match LSB Default-Start values (2 3 4 5)
update-rc.d: warning: apache2 stop runlevel arguments (6) do not match LSB Default-Stop values (0 1 6)
root@mainserver:~# find /etc/ | grep -i rc | grep apache
/etc/rc3.d/S02apache2
/etc/rc0.d/K01apache2
/etc/rc4.d/S02apache2
/etc/rc5.d/S02apache2
/etc/rc2.d/S02apache2
/etc/rc1.d/K01apache2
/etc/rc6.d/K01apache2