Start gnome-shell from another session/terminal/user

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http://askubuntu.com – sometimes my gnome shell gets a weird bug. What I need to do then is to click e.g Ctrl + Alt + F3 When I am there i can login and then killall gnome-shell Then I go back to the first Ctrl + Alt + F1 (what do you call them tty1, tty2, tty3 ... ) back there I can sometimes open a terminal and enter: gnome-shell but sometimes it doesn't work, like now, because the browser window has the focus and no other windows has, and I can't start gnome-shell from the browser, so that's why I am asking the question now :) . The thing that I have tried is to export the display when I am in the tty2 o (HowTos)