Where can I config service startup options in Ubuntu?
Solution 1:
Ubuntu and Debian use Upstart as a replacement for init, but legacy init scripts are supported. Chances are that you can add the option in a script in /etc/init.d with the same name as the service. Also look in /etc/init for .conf files that control the runlevels that services are started and stopped on and how they're respawned, etc.
Solution 2:
First find your config you want to change using the following command:
systemctl list-unit-files
Then change the specific config using the following command:
sudo systemctl edit --full rocketchat.service