How to disable service in Ubuntu 18.04?

ubuntu services boot reboot service

Contrary to previous versions of Ubuntu which were using service command, the recommended way to manage services is to used systemctl command. This command is available on many other distributions of Linux. To disable running service on boot, the sub-command for this task is disable.

Disabling service

sudo systemctl disable <serviceName>

In case of issues with above command you can try also longer form:

sudo systemctl disable <serviceName>.service

For example to disable php7.2-fpm service, use:

sudo systemctl disable php7.2-fpm

Or in extended form:

sudo systemctl disable php7.2-fpm.service

See also how to list services to get name of service or how to enable service.