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I am currently trying to make an autonomous drone using the Robot Operating System (ROS). To do this, I have installed Raspbian Lite (Jessie) on a Rasperry Pi 3 and am currently using ROS Kinetic on it. I decided to go with Openbox Window Manager and installed a terminal onto it for convenience. I can just call sudo startx. Since it is a system-wide terminal, I have also installed tmux for convenience. I am running the xserver on a particular pane and conduct my ROS work on other panes.

Now when I try to run commands that call on a GUI application from my system-wide terminal, I get the error:

QxcbConnection: Could not connect to display
Aborted

After a recommendation from this question, I decided to install xhost on my terminal emulator. After invoking xhost + in the same emulator, I get this:

access control disabled, clients can connect from any host

After which I invoke xhost which returns with: 

access control disabled, clients can connect from any host
SI:localuser:root

Therefore, within my system-wide terminal, I have set the environmental variable to 5 different values which have been listed below, and tried to run the program which calls on the $DISPLAY, but I get the same QxcbConnection: Could not connect to display error. 

SI:localuser:root 
localuser:root 
localuser 
root 
SI:localuser
localhost:0

The last one was actually from the linked question. To my understanding, I am doing exactly what is listed out in this man page. What am I doing wrong?

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  • In the terminal emulator (the one where you ran `xhost +`), what is the output of `echo $DISPLAY` ? – JigglyNaga Jan 04 '17 at 10:48
  • @JigglyNaga it says `:0` – SDG Jan 04 '17 at 10:50
  • @JigglyNaga What should I use as the $DISPLAY on my first virtual terminal device? – SDG Jan 04 '17 at 10:51
  • The same. `export DISPLAY=:0` – JigglyNaga Jan 04 '17 at 10:56
  • @JigglyNaga Just tried it, and got the error: `QxcbConnection: Could not connect to display Aborted` – SDG Jan 04 '17 at 11:00
  • What GUI command are you trying to run? Do you get the same when starting another X client eg. `xterm`? – JigglyNaga Jan 04 '17 at 11:02
  • I'm not trying to invoke a specific GUI command. I am trying tto however, call upon an application that uses GUI. I don't know what GUI command the application would run. What do you mean by starting another X client like `xterm` though? – SDG Jan 04 '17 at 11:32
  • @JigglyNaga I have posted a new question that better explains my problem. Please have a look at it. – SDG Jan 04 '17 at 11:33
  • @ I can close this question, once you have had a look at that question. – SDG Jan 04 '17 at 11:34
  • When you say you "call an application that uses GUI", what exactly are you doing? What steps are involved in this "call"? If you don't invoke a command, what *do* you do just before this error message appears? – JigglyNaga Jan 04 '17 at 12:13
  • @JigglyNaga `rosrun turtlesim turtlesim_node` is the exact thing I am calling. rosrun is a function that runs a particular node in the ros environment, to my understanding. `turtlesim` is the name of the library and `turtlesim_node` is the specific node from that library that is being called. `turtlesim_node` calls on a GUI window to display the movement of a turtle. If you would like to know more, please take a look at [this](http://wiki.ros.org/ROS/Tutorials/UnderstandingNodes) guide. – SDG Jan 06 '17 at 11:56
  • @JigglyNaga In terms of the steps, I have `ROS` installed on my *Rpi* and I run `roscore`. – SDG Jan 06 '17 at 11:58
  • Please can you try running `xterm`, or any other simple X11 application (eg. `lxterminal` - I don't know what else you've got installed), from the same prompt where you're trying to use `rosrun`? If that works, and the new xterm appears in the already-running X session, then you've correctly set up `xhost`, and we can start worrying about ROS. – JigglyNaga Jan 06 '17 at 14:16
  • @JigglyNaga let me try that – SDG Jan 06 '17 at 17:36
  • @JigglyNaga none of the other x11 applications work either – SDG Jan 16 '17 at 14:14
  • What error do you get from other x11 apps when they fail? Please [edit the question](http://unix.stackexchange.com/posts/333739/edit) to show the exact command you ran, and the complete error message that it produced. That will make it easier for others to reproduce your problem. – JigglyNaga Jan 16 '17 at 15:00

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