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hey iam also newbie at kali ..i think adding repository wiil fix this problem..go to this file /etc/apt/sources.list

deb http://http.kali.org/ /kali main contrib non-free
deb...

i am running kali linux amd64 version...after installing gnome full tools the system setting couldnt opening and there is not way to access any of the settings too......plz help to fix this..