You can use this script by typing the following in the terminal after you've downloaded the script:
sh disable-dropbox.sh
Then follow the instructions on the screen.
The only thing you need to do is type the username of the user that will keep Dropbox during launch, and not least, you need to be root (the script is fixing this).
This script is tested on Ubuntu 8.10 x86_64, and should in theory work on all Ubuntu versions with GNOME and / or Nautilus that have Dropbox installed.
Good luck!
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