rqt could not connect to display

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Hi

I also have this error and solved by below step, and hope this can give you a hint to fix your problem.

device: ubuntu 20.04 LTS

without nivida gpu:

xhost local:root XAUTH=/tmp/.docker.xauth docker run --rm -it \ --name=linux_gui \ --env="DISPLAY=$DISPLAY" \ --env="QT_X11_NO_MITSHM=1" \ --volume="/tmp/.X11-unix:/tmp/.X11-unix:rw" \ --env="XAUTHORITY=$XAUTH" \ --volume="$XAUTH:$XAUTH" \ --net=host \ --privileged \ osrf/ros:humble-desktop-03 \ bash

with nivida gpu: sudo apt-get update sudo apt-get install nvidia-container-runtime sudo apt-get install nvidia-docker2 sudo systemctl daemon-reload sudo systemctl restart docker

xhost local:root XAUTH=/tmp/.docker.xauth docker run --rm -it \ --env="DISPLAY=$DISPLAY" \ --env="QT_X11_NO_MITSHM=1" \ --volume="/tmp/.X11-unix:/tmp/.X11-unix:rw" \ --env="XAUTHORITY=$XAUTH" \ --volume="$XAUTH:$XAUTH" \ --net=host \ --privileged \ --runtime=nvidia \ osrf/ros:humble-desktop-03 \ bash

is there any solution you found?

I will assume you are asking about a real physical robot, not a simulation, and you are not running ros in a Virtual Machine (VM).

"rqt" is a graphical application, so it requires a Graphical Desktop and a mouse/keyboard/screen to use it. You do not run this command on the robot itself. The expectation is that you set up a separate computer with the same version of ros, network the robot and the laptop together, and then run the rqt app on the laptop.