Ubuntu 18.04 disable FortiClient/FortiTrayLaunch on startup

Hi,

I've been wondering if it is possible to disable FortiClient/FortiTrayLaunch to be activated on startup? I'm using it to access a vpn but not otherwise.

I found these posts:

https://vedran-zulin.from.hr/en/it/security/60-how-to-disable-forticlient.html

https://forum.fortinet.com/tm.aspx?m=97324

But those seem to be for Windows or Android, if I'm not mistaken.

I am able to stot the service using advice found there:

https://askubuntu.com/questions/912216/16-04-command-to-list-all-services-started-on-boot

However, the process 'fortitraylaunch' is still active.

Any hint on how to do that on Ubuntu?

A great many thanks in advance,

Best regards,

Jeremie