I'm using Xfce 4.10 on Ubuntu 13.10. When I reboot my computer, it always opens the Synaptic package manager. How can I modify some starting script such that it won't open it at the startup?
Try this. Go to Settings Manager, and then go to
Session and Startup
Then go to Application Autostart, and see if Synaptic package manager is listed, and Uncheck it.
Also look under the Session tab, and change the Restart Style.