Qt Error with plugin "xcb"

[Tom Krogmann]

Hi everybody,

I'm facing an error when trying to plot with the gnuplot package inside the gnuplot shell using the command : "plot 'contCumulative_0"

Error message:

Could not connect to existing gnuplot_qt. Starting a new one.
qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
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.

Same error appears when trying to visualize the results with ParaView on the command "paraview post.foam". I installed gnuplot using "sudo apt install gnuplot".

Someone facing the same error?

Edit:
Of course reinstalling xcb could be a possible solution, but I've had bad experience with installing/reinstalling packages I'm not sure about and this has already destroyed complete setups/environments for me.

[Andre Weiner]

Hi @Tooom615,

do you have a native Linux installation or do you use WSL?
Edit: in case of WSL, this link might help you.

Best, Andre

[Tom Krogmann]

Hi @AndreWeiner,

I'm using WSL2 and the link fixed the error.
Thank you !