Error when launching rqt
-
hi guys,
I am running ubuntu20.04 server with ROS2 foxy desktop on raspberry pi 4.
Using window10 putty SSH accessing raspberry pi 4 and login to its ubuntu.
When launching "rqt", the following error showed up:
could not connect to display
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.
Please advise.
Thanks -
hi guys,
I am running ubuntu20.04 server with ROS2 foxy desktop on raspberry pi 4.
Using window10 putty SSH accessing raspberry pi 4 and login to its ubuntu.
When launching "rqt", the following error showed up:
could not connect to display
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.
Please advise.
Thanks@John-M-T
I don't know what "rqt" is. But as you can when so many people ask the same question as you with the error message you show, you should set an environment variableQT_DEBUG_PLUGINS=1and then look at the end of detailed diagnostic messages you will get. -
@John-M-T
I don't know what "rqt" is. But as you can when so many people ask the same question as you with the error message you show, you should set an environment variableQT_DEBUG_PLUGINS=1and then look at the end of detailed diagnostic messages you will get. -
@JonB Thanks for your reply. Have used "export qt_debug_plugins=1", but no other error messages except those I mentioned above. :(
@John-M-T
You are not coding something with Qt, aren't you?! You've started a program and this message showed up?!
rqtis RosQt or something like that?Have you used capital letters for
QT_DEBUG_PLUGINS?This error is very common and could come from different sources.
Maybe this helpsLike @JonB also said, you should see at least some more lines when you start the program that causes this error in your console.
-
hi guys,
I am running ubuntu20.04 server with ROS2 foxy desktop on raspberry pi 4.
Using window10 putty SSH accessing raspberry pi 4 and login to its ubuntu.
When launching "rqt", the following error showed up:
could not connect to display
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.
Please advise.
Thanks@John-M-T You're trying to start a GUI application through SSH. This is not going to work like this.
You need to use VNC for example to forward the graphical output to your Windows machine. -
@John-M-T
You are not coding something with Qt, aren't you?! You've started a program and this message showed up?!
rqtis RosQt or something like that?Have you used capital letters for
QT_DEBUG_PLUGINS?This error is very common and could come from different sources.
Maybe this helpsLike @JonB also said, you should see at least some more lines when you start the program that causes this error in your console.
@Pl45m4 Thanks for your reply. You are right, I am launching rqt for ROS application development. I hope Qt experts here can help to give some hints on what needs to pay attention to. Yes, i used capital letters for QT_DEBUG_PLUGINS. Meanwhile, I also looking around for solutions. Thanks for the link provided. Appreciate that.
-
@John-M-T You're trying to start a GUI application through SSH. This is not going to work like this.
You need to use VNC for example to forward the graphical output to your Windows machine.@jsulm hi there, thanks for your reply. Yes, you are right. I am trying to launch a GUI application via SSH. May be the remote x-client was not launched and that caused the "could not connect to display" error. Thanks for the prompt ... will look into that direction for solution. Appreciate that.
-
@Pl45m4 Thanks for your reply. You are right, I am launching rqt for ROS application development. I hope Qt experts here can help to give some hints on what needs to pay attention to. Yes, i used capital letters for QT_DEBUG_PLUGINS. Meanwhile, I also looking around for solutions. Thanks for the link provided. Appreciate that.
-
@John-M-T
TheQT_DEBUG_PLUGINSvariable needs to be in the environment of the running Qt program. My guess is your way is not passing that through to the final program running?@JonB , @jsulm , @Pl45m4 Thanks everyone. I managed to have the problem resolved based on your suggestion and advices.
1. "could not connect to display" error
Because the x-server was trying to connect the remote x-client. But the x-client was not launched. After launching VcXsrv, connection was established and the GUI app appeared on the remote PC (i.e. x-client side).2. however, still have some error message
Although the connection was successful, x-server reported the following error:
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrastManaged to find the solution posted at
https://itectec.com/ubuntu/ubuntu-win10-linux-subsystem-libgl-error-no-matching-fbconfigs-or-visuals-found-libgl-error-failed-to-load-driver-swrast/All error messages are gone by now. Hope this post benefit those who are having the same problem as mine.
Thank you very much guys!
