How to start User Accounts on startup?

I have to run the application User Accounts on Startup (log in), but I do not manage to add it to Startup Applications.

How can I do that?

User accounts normally appears as part of the System Settings (System Settings > User Accounts).

To open it specifically from command line, you have to add either the command:

gnome-control-center user-accounts

or

unity-control-center user-accounts

on Ubuntu 14.04, or

unity-control-center user-accounts

on 15.04+

to Startup Applications.