我试图/etc/group以 root 身份打开该文件（进行编辑），但是当我输入
gksu gedit /etc/group
它给了我
Failed to connect to Mir: Failed to connect to server socket: No such file or directory
Unable to init server: Could not connect: Connection refused
(gedit:6959): Gtk-WARNING **: cannot open display: :0.0
我该如何解决？