This article introduces how to launch Startup Application Preferences in Ubuntu 16.04.
There are differences between English and Japanese which can be confusing. In Japanese, you can launch it with “jidou kidou~(abbreviated)”.
You can also launch it with a command. But it’s long.
gnome-session-properties
If you change the language to English, you can use “startup”.
https://askubuntu.com/questions/159887/where-did-the-startup-applications-preferences-program-go