capture login screen-not sucssecful

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http://askubuntu.com – I'm using Ubuntu 12.04 . If more information is needed, please tell me. I Tried some guides to cature my login screen: How can I take a screenshot of the login screen? http://www.howtoforge.com/how-to-take-a-screenshot-of-your-login-screen I tried the first one, but after running: $ sudo bash /tmp/shot.sh >/tmp/shot.xwd I'm getting this: No protocol specified No protocol specified xwd unable to open display ':0' and i'm getting an xwd file in my tmp folder. running the other commands giving errors. tried the second one, after running: chvt 8; sleep 5; XAUTHORITY=/var/gdm/:0.X (HowTos)