How to disable Apache and MySQL autostart when PC is turned on?

You should disable them using either systemctl (if you're using systemd) or update-rc.d:

systemctl disable apache2 mysql

update-rc.d apache2 disable
update-rc.d mysql disable

This may depend on your init system. Try one of these:

chkconfig apache2 off
systemctl disable apache2
insserv -r apache2

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