How do I prevent Dropbox from being automatically added to the autostart list after launching it?

Command-line option might also work:

$ dropbox autostart n

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From:

$ man dropbox

Click on the icon, preferences, then uncheck the box "Start Dropbox on system startup".

By default, dropbox will start automatically at login. The update-rc.d command is not concerned here. (/etc/rc*.d/directories don't contain dropbox). There is no service "dropbox" (/etc/init.d don't contain dropbox)

If you have installed dropbox with ".deb" package (sudo dpkg -i dropbox.deb), then you may have the executable /usr/bin/dropbox

To disable the dropbox auto-start :

/usr/bin/dropbox autostart n

To enable the dropbox auto-start :

/usr/bin/dropbox autostart y