Syslog displays these warnings and I would like to know how I can find out what they mean in order to search for what can I do about them.
$ cat /var/log/syslog| grep -i 'warn'
Nov 27 13:48:19 pc NetworkManager[781]: <warn> bluez error getting default adapter: The name org.bluez was not provided by any .service files
Nov 27 13:48:19 pc gdm-binary[778]: WARNING: Unable to find users: no seat-id found
Nov 27 13:48:20 pc NetworkManager[781]: <warn> bluez error getting default adapter: No such adapter
Nov 27 13:48:24 pc gdm-simple-greeter[1285]: Gtk-WARNING: /build/buildd/gtk+2.0-2.24.4/gtk/gtkwidget.c:5687: widget not within a GtkWindow
Edit: The question is about how to interpret warnings like this, and not about my wifi.