To enable or disable the aprx daemon under sysvinit, this now needs to be done via update-rc.d at the command line as root or via sudo: update-rc.d aprx [disable|enable] This has been changed compared to upstream because disabling daemons via an environment variable in /etc/default/ causes problems for init systems (e.g. systemd) so it has been deprecated by Debian Policy ยง9.3.3.1 since Policy version 4.1.3. To stop and disable aprx with systemd: systemctl stop aprx systemctl disable aprx systemctl mask aprx To re-enable and start aprx with systemd: systemctl unmask aprx systemctl enable aprx systemctl start aprx