Unable to init server: Could not connect: Connection refused (gedit:15525): Gtk-WARNING **: 01:39:47.904: cannot open display: code example

Example: Unable to init server: Could not connect: Connection refused (gedit:7575): Gtk-WARNING **: 10:17:11.806: cannot open display:

Unable to init server: Could not connect: Connection refused

(gedit:7575): Gtk-WARNING **: 10:17:11.806: cannot open display: