chuck@Linuxbox:~$ gksu shares-admin
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified


(gksu:22753): Gtk-WARNING **: cannot open display:
chuck@Linuxbox:~$ sudo xhost +
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

xhost:  unable to open display ":0.0"