As notice above, I installed this program and also test status with "xampp status" command. But i can not find or open this program(GUI). In terminal, i try to use open it but always had problem " Unknown Error couldn't connect to display ":0" ". What should i do now, how could i do to modify $DISPLAY correct. I also googled and try lots of different ways but nothing happen. Help me!!!!!! Thanks for all help!!